I don't know what to do with Pearl.

She has made such progress on being social lately, but now she has started peeing in the corner in my bedroom. I am pretty sure this is a behavioral problem. She is not sick, she eats like a horse, and is very vocal about getting her way. She seldom leaves the bedroom, because she we have always let her do things on her terms. She even has her own litter box in my bathroom because the others chased her from the room where the rest of the boxes are. I have even been feeding her in there so the others will not steal her food. Think I have contributed to her being spoiled, and maybe did not do her any favors. Maybe I should have forced her to eat where the food is and take up for herself, which she has begun doing pretty well lately, as well as just being hissy with the others if they are going about their own business that just happens to be near her. If she continues to pee out of the box, I may have to rehome her. I really do not want to do that. No one would want a 6 year old cat with behavioral problems. Any suggestions would br greatly appreciated.

How about trying another litter box in your bathroom?

you could temporarily put a litter box over the spot where she's been peeing...see if this is a behavioural issue (i.e. refusing to pee in the litter box) or something about the litter box in the bathroom).