I have a flock of 13, and one of them is a Polish. They are all just over 6 months old and were hatched on the same day and raised together. A while back I noticed her head feathers were being pecked and got some BluKote spray. It improved but seems like it gets better for a while then gets worse again. She keeps herself segregated from the rest of the flock, stays to herself outside, often in the coop during the day when the rest of the flock is outside, sleeps alone on a different roost than the rest. Things have taken a bad turn. She seems lethargic and is being very quiet. She doesn't really react a whole lot when I pet her, which is abnormal, and only slightly reacts when I pick her up. Instead of roosting to sleep she has been laying either on top of a poop board or on the floor of the coop. I can find nothing externally wrong with her other than her head feathers being pecked. Her wings and legs are working perfectly fine. No sores that I can find or parasites. My husband and I both work during the day so I'm not 100% sure about her food and water intake. She seems to be walking and moving around and moving her wings just fine but very slowly and timidly. I have moved her to an unused top nest box to be more comfortable and hidden. This evening when I came home from work and went out to lock the girls in the coop for the night, everyone was inside except for her. She was outside laying partially under the ramp going into the coop and it was already dark. Can this all be happening due to bullying and her head feathers getting pecked out? Or is there possibly something more going on that is not related? We are rehoming her with a friend that has a very gentle flock, but I don't want to give her a sick chicken if there is something more going on other than bullying. Please help!