I noticed a few days ago that one of my EE's appeared to be missing some feathers on her back (just before her tailfeathers) and her cheeks. Today it is worse. Is this a sign that someone is picking on her? All my hens are about the same age and have been together since I got them. It has been cold here (in the single digits), but all look heathly and no frost bit. She is still laying. That's about all I can tell you. I am still new at this and wonder what the experts thing.