I'm assuming you have checked her over really well for an egg stuck in her crop and any sort of parasite. Mine have never had either happen yet so I don't know exactly how they act when that happens. But I do get broody chickens and they act a lot like that. The one I allowed to sit on and hatch chicks didn't eat for a couple weeks. She lost a lot of weight, but everything I've read said that's normal.I sure hope you are right. She just woke up and tried to stand but couldn't. I haven't been able to get her to eat or drink hardly anything this evening.