I think you should kidnap her. Does she go outside at all? There is something wrong here. Sounds like a power struggle. "A: is obviously not attached to Callie. Maybe you could tell her you want to take her to the vet (which would cost money) because she doesn't look healthy. Say maybe she has feline leukemia or something so "A" doesn't think you are slamming her. Go to the vet and then keep her. I bet the vet tells you she's in a stifling environment and doesn't want to live. It happens to humans. Possession is 9/10's of the law. Or so I'm told.