Hi I have an americana chicken, about 7 months old, and she has multiple very concerning symptoms. they are: - vomiting - droopiness in the head and wings - head and neck feathers are turning white - skin is flaking - out cast from the rest of flock I have caught some of the other chickens pulling her feathers on her neck and head, and in general pecking at her. Blood has been drawn on her comb from the pecking, so I put her in the 'Isolation Coop' as I call it. She has a heat lamp, which she appreciates, and everything she needs. the coop has a little run on it for her and everything, but in the mean time, i don't know what to do! Help!