Oh my! I know how painful that can be, and frightening. If she bites your lip and doesnt let go, you have to do whatever you can to get her to let go. I would take my other hand and use my fingers to try and force her beak open until she released my lip. Other body parts, I have good luck with lightly blowing on her face, she will let go to shake her head from the breeze. After one bite like you had, I would keep my face away from hers. One bite and you could end up at the doctors getting stictches. I have 3 parrots, one is not allowed close enough to my face as she is unpredictable and startles easily. I know she is an occasional biter when frightened, so I never allow her near my face. She can sit on my shoulder, but I keep my face turned away just n case.