It's called the Pariah Cat Syndrome. Sometimes you'll have one cat that, isn't aggressive, doesn't bother anyone, yet the other cats in the household pick on them relentlessly. I had a cat like that and I finally had to rehome her for her own safety. All she wanted to do was be loved and get attention. The other cats wouldn't allow it. You've gotten some great advice here. I'd try everything I could to come to some kind of happy medium. But unfortunately sometimes nothing works. I certainly hope it doesn't come down to that because it is a very difficult decision to make. But you're going to have to decide what is in her best interest. If it means rehoming her, then you've got your answer.

(((((HUGS))))) and good luck to you Lori. Please keep us posted.