She has wry neck or crook neck. She needs to have Vitamin B1 thiamine, vitamin E, and 25 mcg of selenium daily. Wry neck can be caused by an injury, vitamin deficiency, or an infectious disease. Keep stimulation to a minimum, but you may need to help feed or get water. Flubenvet is a very good wormer, although I doubt if your chicken has gapeworm. It is probably having trouble eating due to the wryneck. Offer your chicken some soft egg and a little salt free tuna.
