I have a fantasticly colored Americana hen about 6 months old. She is by far my favorite hen, she is dominant among her sisters and all of them (12 new birds) has been in the flock for more then 2 months with no problems once the pecking order was established. Tonight I went to put them away and her back right above the tail is all torn up, featherless and open. There is no more bleeding but any time another hen sees the wound it begins to peck at it. Any suggestions on how to treat and what to do to stop the pecking, because it is cold here, I live in the mountains near Lake Tahoe, I can't easily separate her in anything but a small bird cage.