Thanks for taking in this sweet little girl. You've received some good info. already. One of the things you can do to get her to enjoy being stroked is to place her in your lap---if she's a bit sleepy even better! Place her in your lap facing away from your body and stroke the back of her neck and head with short upward strokes with your forefinger. This mimics a momacat's licking and most kitties respond well with this type of stroking. If she starts to bite aggressively, stop the stroking and offer her a toy to bite at, or use a piece of cord for her to follow. Ignore any aggressive biting, say "No" if she makes contact with your skin, give a toy and walk away. You want her to get the idea that nice things happen when she shows good behavior. Good luck!
"We humans are indeed fortunate if we happen to be chosen to be owned by a cat." -- Anonymous