Elvis Has Left the Building...Again

This time, we had to make Elvis leave the building by moving her to our "hen hospital" in the shed. Yesterday Elvis had blood around her comb. I don't know if it was caused by an accident, the cold or the other chickens. I was able to get some anti-biotic ointment on it and hoped things would better in the morning. When I went outside today, she was worse and there were drops of blood all over the coop. I knew we had to separate her if we were to have any chance of saving her and keeping the other chickens from pecking at her. So we set up our old dog cage in the shed and moved her out of the coop. I have read all the chicken books and I haven't seen any mention of comb injury or what to do about it.