I have a Rhode Island red she is about a year old and a few days ago she stopped leaving the nest. She seemed fine but I simply thought she wanted to sit her eggs. I took the eggs but she has not left the nest. Checked her this morning still int he nest no new eggs vent looks fine but her feathers are all gone on her gullet and chest. She makes a funny growling noise when I get close but lets me touch her. Thoughts? I am going to separate her from the flock. What could be causing this behavior and the feather loss. It doesn't look picked at.