I have a hen that was healthy and doing great lastnight. today I go out and find she laying in the middle of the run. She is breathing but that is it. eyes closed and just laying there. I looked at her vent to make sure it looked normal which it looks fine. When I lifted her tail feathers she fell to the side and was to weak to even get back up. There is no animal that could of gotten in there and I just don't know what could of made her sick. Anyone have any ideals. I am afraid it is to late to save her but I am willing to try whatever I need to. She is one of my fav. hens