Ive got a 9 month old Barred Rock hen who is usually my most aggressive girl who is now behaving listless, reluctant to eat. Her comb looks slightly pale and really droopy. Eyes and nares are clear of any discharge. She does have a pasty mess of foul smelling stool on her rear. I have separated her from the rest of the flock for observation. Any ideas what I am dealing with here? I watched her for a while in the run before I decided to separate her and she seemed as though she was straining to defecate. Her crop does not seem overly tight or hard either. Any insight will be appreciated.