I have a chick that seemed fine this morning at 7:30 am. I went up to the barn again around 10:00 to find her standing there with her eyes clothes and falling backwards onto her tail. She would not walk at all. She is breathing fine. She is in the house now so I can monitor her. She's very lethargic, can't stand up and rocks backwards onto her tail if she tries. Every once in a while she perks up, cheeps, pecks at her hay bed and looks around. Then back down she goes and seems to sleep again. I got a little water into her but no food. Any ideas? This came on suddenly it seems.