When I went out to lock up my chickens tonight I found blood in the coop. One of my chickens has been picked to shreds on her left side near her hind end. There is a big chunk missing and skin hanging. I think the other chickens must have attacked her and just kept going at it. I brought her in and rinsed the area under warm water to see the damage and its not good. She is also continuing to do further damage to herself! I cant imagine why she is picking herself apart even worse. I do not live in an area with access to an avian or chicken vet and I do not have access to antibiotics. What do I do to make her stop pecking herself? Do I need to cull?