I went out to my coop today to find an unpleasent surprise. One of my hens has lost her feathers in patches. Her remaining feathers are rough and dishevled. At first, my mind went to bullying from the other birds, especially my moody guinea hens. After further inspection, I'm not so sure. Her, for lack of better words, feather "nubs" are still fully intact and unharmed. I thought if she had been pecked, she would be a bald, bloody mess. Is this pecking, or something else? What can I do to help her until I have a place to isolate her? Here are some pictures.