Hugs
I could write that exact same post. My son is the biter here, and the only child he bites is the one girl who screams her head off if anyone looks at her. Sometimes, she will gather an armful of toys, and seek out a child to scream at.
What I have done is I make one of them be with me at all times. I don't care which one, but I never let them play together. When I am making meals, I always bring one of them into the kitchen. When I change diapers, one of them stands with me the whole time. It is modified shadowing I guess, but it has worked. In the past, I tried shadowing just the one child, but he would bite her even if I had her on my lap. If they are never together, he can never bite her.
I understand the stigma, it is awful.
Confidentiality applies to you too though, you don't have to tell who bit, just that she was bitten. I hope you get through this soon. I honestly thought I was going to have to close there for awhile it got so bad!