Just went out to check on my chickens and one of my teenage silkies was laying on the ground flipping around. I picked it up and she was holding her head crooked with one eye looking upward. I sat her outside of the pen and she got up and straightened her head some and started eating grass and even was able to catch a fly. Earlier I didn't see any notice any of them having problems. Could this be from a head injury or something else?