have a Barred Rock hen that I found in her hen house limp, she is unable to raise her head she was fine the night before, then found her the next am in bad shape. Haven't changed feed, about the only thing I can think of is heat stroke, I don't know how old she is she was supposed to be a pullet but now after having chickens for awhile I have doubts her comb was fully formed and she laid from day one we had her. She's been with us for about 18 months and has never been sick. After I found her she felt hot, but the hen house is cool. Sponged her off with tepid water and used a syringe to give her water which she drank. I placed her in a cool spot away from the other chickens and have been making sure she is hydrated. She's been this way for 2 days now she can hold up her head at all. no sign of predator getting into the coop, she has also laid for both days found eggs with her, she's in a pet carrier with the door closed so no question that that they were her's. Any suggestions would like to save her if possible she's my favorite and a sweetheart.