I have an elderly chicken that is dying, she is very lethargic and closes her eyes frequently, she has eaten and is drinking, she is pooping normally and last evening I isolated her from her flockmates and returned her to the coop this morning as she seemed quite bright in herself, she has been with the other chickens all day but I don't know whether to isolate her again for the night or leave her in the coop...I would appreciate thoughts from anyone here as to what would be best for her right now.