I have a Barred Rock hen that is losing feathers. I am hoping that some more experienced chicken keepers could give me some idea as to what it could be. Henrietta is about ten months old. She has been being housed with three other hens, all four of which I have had since chicks. She does seem to feel a little lighter than the others so I would say she is running on the skinny side. She has lost so many feathers to the point that she has bald spots, especially under her wings, on her belly, and around her vent. She also has some feather loss on her neck. I noticed an abnormal amount of feathers in the coop on Monday and immediately checked for predators and to make sure the girls were okay. I noticed the feather loss on Henrietta and kept a close eye on her until Friday, when I decided to separate her to better pinpoint the problem and to completely rule out bullying. After moving her to a dog crate in the garage, I noticed that the feathers continued to fall out, and since I have never seen anyone bullying her, I don't think that's the issue, but I could be wrong. I have been keeping an eye on the others and no one else seems to be having the drastic plummage loss like Henrietta. She has no bleeding, but does have bare skin showing. I have tried to look closely at her skin and my unexperienced eye cannot see any sign of mites or lice. I did notice some peeling skin on her belly, but that's the only thing I noticed. We live in south central Michigan and our weather has been all over the place so I wonder if it could possibly be a stress molt? She is eating DuMOR layer pellets, water with a little ACV, and some 5 grain scratch as an occasional treat. Her poop seems normal. The feathers appear to be ripped rather than being plucked completely out. She has not laid since I separated her. My questions are- A: What are some reasons her feathers could be falling out given the circumstances? B: Would it hurt to stick her back in with the others? C: What are some things I can do to help her/resolve the problem? (Sorry for the bad quality pics)