I have a rhode island red, age unknown because I adopted her. I would guess under 3 years old since she laid every day all summer and fall without fail. I am in Chicago area, very cold winter right now. She has stopped laying completely, for about 2 weeks now. Appears to be loosing feathers, can't tell if shes molting or not. She has no interest in treats like the rest. Hangs out by herself and is always puffed up. I see her eating sometimes, but not like usual. Her eyes and nose are clear. No signs of coughing or breathing issues. Is this normal winter behavior for older hens? My others are all pullets, with boundless energy. How do I know if shes having problems with her body heat regulation? Sorry for all the questions, but I am worried mess as most of you can understand.