American Pit Bull Terriers

Question time!! I have an American Pit Bull Terrier, and she just turned a year old. I moved into my dad's girlfriends place and of course i brought my baby with me, cause duh, she is like my child. During Christmas I came back to my boyfriends house but I couldnt keep her here due to his parents and the whole "Pit Bulls are bad dogs" rumor, and i refused to keep her with my dad and his girlfriend because they were very mean to her. They said they were trying to "break" her and "train her" but I didn't know shoving her nose in her own urine, and practically beating her, was training or "breaking" her. That made me very very mad! So I brought her here and I had some of my friends watch her. My dog, Doja, is an inside dog. She goes outside whenever she wants but I keep a very good eye on her. The place where I left her has another American Pit Bull Terrier, but she is six years older than my dog. Doja was left on a chain in that other dog's area, and being that these kind of dogs are very territorial, the other Pit attacked my dog, and Doja defended herself. I had to take her away from where she was staying because Doja's ear got infected from the attack and she just wasnt being taken care of, and i was being lied to. POINT IS, MY DAD SAID SHE IS NOT ALLOWED BACK THERE BECAUSE "SHE GOT INTO A FIGHT DOWN HERE AND NOW SHE IS GOING TO ATTACK ANYTHING AND EVERYONE WHO GETS IN HER SIGHT."
Is that true? I dont think it is. First of all, Doja did NOT start the fight, she was defending herself. The other dog attacked her, and it was the other dogs owner's fault for putting my dog on HER DOG"S leash, knowing fully well that her dog is territorial, but my dog isn't, she is just a happy, loving pup. Doja has never attacked anything or anyone and I feel like my dad is just saying that because of the bad rep Pits have. its so unfair because now I need a place for my baby. What am I going to do? i need help, someone, please? I cant lose Doja, she is like my first kid. I love her too much to lose her.

So, someones help and advice would be greatly appreaciated!!

Thanks-- Alyssa K. 19 y/o from Central Cali