Hey, I have a full grown hen who had an earlier health issue. She recovered but was very weak. As a result, she was quickly demoted to the bottom of the pecking order and was being picked on all the time. I put her with my 13 week old chicks who are in a separated part of the coop for a "sleepover". Everything was fine but then she started getting edgy with my new girls. I put her back in with her original flock. I was putting them all in for the night when there was squabbling. I ran in to see all of her same breed surrounding her with 2 on top pecking her head with the rest in a circle around her ( also pecking). I have separated her and her head was bleeding pretty badly. I have put her back with my younger chickens after cleaning her up but don't know how proceed from here. Any ideas?