I have a little cochin hen that is fairly young. Maybe three-five years. She has not exhibited any signs of illness and doesn't have any signs of trauma. She was laying up til a few days ago. She is very obviously blind today. We are heartbroken as she is our "pet" hen. Could have happened to any one of the nameless, mean hens, but oh no, happens to our little Sipsy. Any ideas what could cause this? I can only guess that she has eaten a weed or some kind of mold? Any cure or medications?