Hello! I have 6 girls that share a coop, run, and free range play yard. It seems as though one hen in particular is getting picked on. No one else is missing feathers from their lower back and tail. I cleaned the coop out this morning to find a lot of her feathers in it. We got the girls all together in April and they have been together ever since. We recently just had a down pour of rain, in which they retreat to their covered run and coop. What can I do for this poor girl? I can see the ends of her tail feathers missing in a big patch. I attempted to get a picture, but this is the best I can do.