I have a NHR hen who is about a year old and is suffering from really bad diarrhea(like clear liquid) and is very listless. She was fine yesterday but now her butt is very red and irritated and she has poo sticking to her feathers back there. She hardly moves unless you move her out of the nest box, where she stays all the time now. Her comb somehow looks shrunken and her feathers are puffed up constantly also, she isn't laying or eating and she hardly drinks. Any suggestions?