I have a limping pullet. She is about 4 months old. She can put weight on it but, doesnt like to at all. She doesnt move much because of it hurting her. She just lays in one spot unless she see us with a treat. She is in the house because the other chickens started picking on her and not letting her eat. No wounds. No bumblefoot. She has been like this for about 3 days. What could this be?