My poor girl for the past couple of months has been sitting over in the corner sleeping or walking around with her eyes half closed. She's just in general very lethargic she still eats and drinks some and there is no bullying from the other 6 hens who she is with in a pretty big coop with hay bedding. She hasn't started laying yet this year. This morning I noticed she panting with her mouth open and her eyes closed. Any ideas what's wrong with her or medicines I should use or anything?