Find a toy that really pops with her, either her ears prick up, her tail wags, eyes get big...any kind of reaction. And play with just that toy. Or if she dosent seem at all interested in toys, just you and her play. Get on the floor and act like a dog try getting her to play that way. Then you can introduce her to toys.
If you dont want her to associate hand and her mouth or rough housing/biting then put maybe stove gloves on so she cant tell those are your hands their just toys...that might work?
Like just4hmm said it might take her a while to warm up.
Kudos on adopting a pitty! I rescued one to! They make such great pets. And remember shes a rescue so she might never had anyone play with her or she could have been abused you never know.
Good luck, I hoped I helped.