Both stormreach bracers and titan mauler are fine, though their abilities won't stack, so no swinging huge weapons.
You can take more than ten levels of mystic theurge if/when you hit epic.
Keep in mind that catfolk have a Wisdom penalty, so you may want to go with Oracle (or even Oracle/Sorcerer), considering Catfolk get a Cha bonus.
If you're looking for alternate mechanics to represent a catgirl, beastbrood (rakshasa-spawn) from Blood of Fiends are shown to look like catgirls. They do, however, have the same ability modifiers (+2 Dex, -2 Wis, +2 Cha).
Also, ShadowFox89's kitsune ended up as a waitress because she was caught stealing from the World Serpent Inn, so your catgirl may want to be careful about whom she charms~
@rancorius & Callie Del Noire
Plenty more room, considering this isn't really a standard campaign. Pitch your ideas!