My hen is doing the same thing! She went through a cycle of similar behavior last month, near the beginning of her molt. I separated her, put on a heat lamp, and offered her food and water often, which she didn't want. She kept falling asleep. I took her to a vet, who examined her and found nothing wrong. We did two fecal samples and found nothing. I found some lice and treated her for it. After maybe a week?, she started to act a little more normal. Shortly after she was back in the coop. She was acting completely normal for a month, and it just started again. No appetite. Her poop is all white and runny. Her crop feels mushy. She keeps a tail low stance and often has her feathers fluffed up. When I get her out of her crate, she moves around slowly, but she still seems coordinated.
I hope you get some answers, because I too am at a loss for what is happening with her, despite spending hours and hours reading this site.
