My sweet Rhode Island Red has been suffering for over two weeks as she becomes more and more lethargic and refuses to cone out of her coop. Her backside is VERY messy. Her comb has lightened in color and flopped to the side. When she does come out of the coop she is disoriented and seems almost as if she is having trouble seeing her way around the yard. She is also missing feathers on her backside which may be a result of the other eight hens in the flock picking on her. Any advice would be appreciated!