This is my first post. Our favorite hen (largest, most docile) has no feathers from her vent all the way past her legs, starting toward her belly. Some bleeding, crusty areas. (Pecking from other hens?) None of my hens have started molting yet. Is this the first sign of molting? No other feathers have come out yet. Hard to tell if she's still laying. Does not have a prolapsed vent. She is still eating and running around the yard. I just put some Aquaphor on it. It has been below freezing for the past few nights/days. Is her butt in danger of frostbite? Pictures posted below. Thanks for your help!