I'm going to do some character comparisons. The first one is Walter Palmer fifty five year old Dentist from Minnesota that was recently outed for trophy hunting a beloved lion. The second one is going to be Sam Sheridan, a writer and his life experience up to the age of thirty, and Chris Kyle, a much lauded Navy SEAL sniper who was recently murdered and whose widow was screwed over Jesse Ventura in a court libel case recently. And we'll compare these characters to my master dabbler, Leah Layleigh.
She's a medic, an explosives expert, a chemist, a drug manufacturer, a poisoner
First off, a medic was required. But she's not an actually formally trained medic. She's actually had pharmaceutical training, and veterinary training and has largely actually been self taught or learned informally. I figure that gave her experience roughly equivalent to a medic (ie the four months a typical medic gets of dedicated medical training or EMT Basic training which is three weeks).
Saying she is a chemist drug manufacturer and poisoner is almost a contentless statement. She can cook meth using chemicals. She can create poisons... because she has a background in pharmaceuticals. A large amount of female murders were actually known for being very good poisoners. Creating poisons isn't a hard thing to do if you know how to cook meth and have pharmaceutical experience. Furthermore I never stated she was a formal chemist. It was mentioned that there was hope she could be when she was young that she could eventually go to college and be a chemist or chemical engineer or whatever because she was a smar tween, but it never happened.
Furthermore, she was never stated to be an explosives expert. She was familiar with explosives. In Michael Moore's documentary
Bowling for Colombine he interviews High School Working Class kids who can make pipe bombs (like the Colombine shooters) and nail bombs and knockoff forms of napalm. You can see the videos of people making homemade napalm on Youtube. She grew up cooking meth. She knows how to make things blow up and not blow up since many of the chemicals used in meth and cooking other drugs, can also be applied to the creating of homemade explosives. Now lets look at our three examples and soon how they rate compared to Leah:
Walter Palmer is a dentist who went to medical school and been in practice and refresher courses for most of his adult life. He is a superior medic. He is probably subpar in concocting poisons and drugs but he has as much book knowledge to do so, if not the applied knowledge. He knows more about chemistry. He probably knows little about explosives.
Sam Sheridan is a trained firefighter, athlete and wilderness EMT and so likely has nearly the same amount of knowledge in medicine as Leah but knows more then her in regards to nutrition and therapy etc, It's doubtful he knows much about poisons, explosives or drug manufacturing however.
Chris Kyle was a Navy SEAL. He knows battlefield medicine and actually knows more about mental trauma and talked about it extensively post service. He used his medic training on several occasions. He also has training in NBC warfare and has been schooled on it formally. He might not know how to create more effective poisons then Leah, but probably knows more about chemical weapons and biological weapons and recognizing them etc. And if sufficiently motivated, he probably could conjure up something jury rigged like a simple chlorine bomb. He obviously knows more about explosives. His only weakness is I don't think he coks meth.
Interesting contrast so far.
a con artist, a pickpocket, a lockpick, a security expert.
Being a pickpocket, lockpicker and "security expert" which I'm assuming means burglar, almost goes hand in hand. The only exception to this is a con artist (or the term I use grifter). But being a grifter is still fairly common with most criminal activity beyond the street level stuff of mugging, buglarizing, pocket crimes etc. So I don't see it as exceptional. I'm not sure where her being an expert came in. Disabling alarm systems and evading them was described as basic knowledge. Lets compare this to our three individuals.
Walter Palmer is clearly inferior in all categories, except he can allegedly con or bribe local officials to allow him to hunt lions.

Or allegedly sexually harassing female receptionists.
Sam Sheridan seems like he'd be inferior to Leah but when it comes to grifting, because he's trained in drama and acting, he might actually be superior if sufficiently motivated. Furthermore, he references in his books that he learned how to pick locks and steal cars. So slightly inferior to Leah.
Chris Kyle probably can't pickpocket anyone, but Navy Seals are trained in lockpicking, breaking and entering, security systems and how to evade them. Furthermore Chris Kyle's specialization besides Seal training was in electronics. If anything, Chris Kyle might be a superior thief if he ever had the desire to be one in regards to things like burglary and breaking and entering. He's also decent at grifting. Navy Seals aren't as well trained as CIA Field Agents obviously, or even Green Berets, but tier one special operators are trained extensively to collect intelligence and gain confidence of locals etc, not so much spies or grifters as intelligence gatherers and interrogators and so forth.
a hunter, a tracker, a wilderness guide, an archer, a solid marksman, a trapper
Hunting, tracking, wilderness guiding, marksman(woman) and trapping almost all goes hand in hand that listing it individually is baseless. Alex is also a hunter and has military training and experience. Thus she therefore knows everything up here... except maybe archery which Leah is described as having a proficiency in. I don't know about you, but archery doesn't seem to be a very useful skill in this RP. I added it as window dressing for her rural background. How does she compare to the others though. And trapping is just making... traps... kind of shitty hunting. Depending on the nature of it, it might be considered unsportsmanlike.
Walter Palmer has hunted game across several continents and ranged from cougars, (the big cats, not older women), bears, elk, lions, rhinos and so much more etc etc. He probably has more experience hunting in North America and Africa then Leah. He is a superior hunter. He's probably also a superior archer as he's used both a crossbow and modern compound bow and killed large game with it. As marksman, they maybe equal, I have no idea. Trapping... again no idea. Wilderness guide... whatever that means... I guess Leah is superior due to her grifting skills.
Sam Sheridan. He's not a hunter or trapper or bowhunter or marksman AFAIK. However he has traveled the wilderness extensively and has been a forest fire fighter. His outdoorcraft is probably slightly below that of Leah.
Chris Kyle, due to his rural background, is easily a superior hunter, tracker, and due to being the most lethal sniper in history, obviously a superior marksman. He's probably a superior trapper as well. Beats Leah in all categories... often quite clearly.
So basically Leah barely edges out a dentist and a writer, and is schooled by the Navy Seal.
a watercraft pilot, a driver, a mechanic
These skills are so common, it is baseless. I think every character in this RP can drive a watercraft and drive a car and knows basic maintenance. She's lightly above the others in watercraft and mechanic crap... though I barely remember remarking on her being a mechanic. Lets compare her to the others.
Walter Palmer, if he's like the dentists I know, probably owns his own boat and takes it to one of the ten thousand lakes we have in our fine state every weekend he can. So he's a watercraft pilot, we'll assume. He obviously has a drivers license and can drive. No idea if he knows anything about machinery. If his hobby is boats or old cars, he might know a fair bit about mechanics. Either way, Leah is probably equal or slightly superior to him.
Sam Sheridan went to a Merchant Marine School, and spent many months sailing and boating . He too has a drivers license and maintains boats and thus has a great deal of mechanical knowledge. He's superior to Leah in every regard, clearly.
Chris Kyle is a Navy Seal. He knows watercraft and talks about operating them. He's also familiar with small engine repair and maintaining all manners of equipment including weapons, radios and other military equipment. He's also a pretty good driver. Clearly superior to Leah in every category.
an amateur martial artist,
I stated that Leah brawled with her siblings when she was young, took random martial arts classes (who hasn't) and not until recently, learned how to properly throw a knee and kick implying she didn't know how to do either before a few months ago. Whatever... let's compare....
Walter Palmer. I'm assuming he has no martial arts knowledge.
Sam Sheridan. Actual MMA fighter whose trained in multiple disciplines including Thai Kickboxing in Thailand, Brazilian Jiu Jitsu in Brazil, MMA in America and Boxing with former Olympians. He'll kick Leah's ass.
Chris Kyle... yeah... don't even need to say whose better here.
So after all that, we see in those categories... Leah is probably superior to the dentist, slightly inferior to the writer, and inferior to the Navy Seal sniper in the fields she's apparently proficient in.
How damning... but wait... there's more. While due to lack of knowledge I have no idea if Walter Palmer has anymore skills, we know Sam and Chris do. In addition to what was stated already we know Sam is proficient in the following: Business, Enviromental Sciences, Painting, Writing, Journalism, Firefighting, Carpentry, Construction work, athletics, sports medicine, arctic survival, philosophy, history, knife fighting, boxing, etc etc etc.
Chris Kyle meanwhile we know is proficient in the following: Electronics, radio operation and repair, counter-intelligence, interrogation, animal handling, horseback riding, underwater demolitions, rescue swimming, diving, salvage, videogaming (he was a gamer), writing, history, experienced in the rodeo, theology, night fighting, animal husbandry, knife fighting, sticking fighting, spotting, orienteering, small unit tactics etc etc etc.
And I just used the first three names I could think of. As I write this, I'm can just take a moment and see how she contrasts with someone like Les Stroud, or Sam Childers, or John Goddard, or Eric Rudolph, or Kinessa Johnson.
The moral of the story is that the first Leah Layleigh ain't hot shit. She's exactly as described. A jack of many trades.