Again LP , I am so sorry.
I saw for myself yesterday afternoon how bad the injuries are.
I know how hard you have worked with these dogs , to make everything ok. At this point , there's nothing more you can do. As the vet and his staff told you , I also think it would be best to rehome Ava.
Separating the dogs wouldn't be fair for any of them , for you , and for your family. And accidents could still happen , and I don't want to think what could happen ... the next fight could be fatal for one dog.
Only once did I had to separate dogs. A foster , for only a month. It was hard on myself , the foster , and my dogs.
You did so much for Ava , you only took her in to help someone that was in a bad situation , you were only suppose to have her for a few months , and ended up having to keep her. I know you love Ava and didn't mind keeping her but , you were put in front of a situation were you didn't really have a choice.....
And I must add , Ava is a very good girl , she's ok with most dogs , and loves humans. I just think she should go to a nice calm couple , with no other dogs so she can retire and get all the loving she can get.
I know , it kills you to read this
but there's no other options.