We thought we were going to lose one of our hens. She became lethargic and kept to herself, had stopped laying, had a bit of a pasty butt. So we gave her epsom salt butt baths and anti fungal spray on the butt feathers, and she seemed better. Then she got worse again, I even saw what looked like she was trying to vomit a bit and her comb was flopped over, she spent most of a day in a nest and kept away from the others. She wasn't eating her favorite yogurt snack, either. So I put some probiotic in their water and the next day she seemed better, even came to the door for her mealworm snacks. and even came out and foraged a bit. Then yesterday, voila, she seemed her old self again, her comb was mostly standing up, and she was out and about as usual. Tonight I noticed that she was roosting up in her usual spot next to the rooster. I have no idea what was wrong, but I'm glad she seems to have gotten over it on her own. I hope she starts laying again, she had been my best layer.