I would say yes, there is still room. You were going to do a psychic or reader or something like that? Or was that someone else? Sorry if my memory is a little hazy.
No she would use the Firefly as an administrative base to run the girls on various planets and some brothels. At most she might have a personal consort on board for her needs. She might have a few girls she recruited to set-up base on a new planet or something but likely will spend most of her time plotting agianst the Guild incursions into HER business.
Uhm, part of that would depend on the Captain, now wouldn't it? Am not saying he would object, but he does get a say in what happens on HIS ship. Unless you happen to own the ship, of course.
Also, how much money do you think you have? Even with Moneyed Individual, you would only start out with something like 2250 credits. A Companion would typically charge about 450 a day. Admitted, a whore would get a lot less than that, but don't see you starting with having enough money to have a bunch of girls working for you. Later on, as you got more money and contacts, yes. At start, no.