I noticed my 1.5 year old barred rock laying in the nesting box today. She had already ĺayed today, so I wasn't sure why she was in there. So I made her leave and go into the run. She drank a little water, then just laid where I had put her, and began closing her eyes. After an hour of watching her, I knew something was wrong. She is withdrawn, and keeps going I to a corner by herself. She is not interested in food, even tried scramble eggs. The egg she layed today was normal, the shell was hard, it was very thin, felt like it would break easily. Upon examining her, she has no mites or lice. Her crop was fairly full, but it was evening. No respiratory symptoms at all, nothing coming out of her vent, or mouth or eyes. She pooped, and it look a little yellow, but formed. She has poop on her bum, but she has always had this, not unusual for her. Part of her comb may be purplish? I will post pictures and a video. I don't know how to help her if I don't know the problem. I thought maybe Egg yolk peritonitis, but her belly doesn't feel distended. Oh and noticed her belly area has a big bald patch. She has never had a molt yet . Her tail feathers are all pecked off too. Not sure why.