I think my chicken has a broken leg. All of the chickens were up against the fence like usual except 1 that was laying in the back of the coop. When I walked up to it, it just hung it's head and sat there. When I picked it up, I inspected it's wings and everything, but then I pulled her right I felt a pop and she jerked away. Does that mean a broken leg, and if so what do I do?