My 27-year-old granddaughter adopted a formerly abused 4-year-old female Pitbull from a shelter. So far, she has been docile, except for the first time she was introduced to my daughter. My daughter tried to stare her down before putting her hand out to pet her and she promptly got nipped on the hand.
I had better sense when introduced to her and she was fine with me. Dogs love me but the German Shepherd is the only dog that has ever bitten me so I stay away from them. Even when I worked for a Vet as a tech, I was never bitten. I have handled Rottweilers, Dobermans, hounds of all types, Akitas, and many other aggressive breeds. I let the other techs handle the GSD’s.
Your granddaughter is playing Russian roulette with that adopted “previously abused 4 yr old female Pitbull”, IMO. I hope and pray that dog never turns on her or anybody else. That said I do hope she is extremely vigilant with that dog.