My favorite chicken Audrey started to loose her neck feathers around fall time. Originally I thought she was just molting, and they'd start to grow back eventually. However her feathers still haven't grow back, and another chicken that we have that is the same breed is now loosing her neck feathers. I'm new to chickens, and I'm not sure what is going on?? She is still very active, hungry, and talkative. I don't really notice the other chickens picking on her to much. We do have a rooster, but I've never seen him rip feathers out. Is she sick with something? Or is she deficient in some kind of nutrients? Audrey is in the first two pictures, and Erie is in the third. Audrey used to be the most beautiful chicken, and it makes me so sad to see her bald :( If anyone can provide some insight I'd really appreciate it.