I have a chicken who has been lethargic, standing in the same spot, eyes closed a lot, white diarrhea. She won't eat, but drinks water. I checked her bum and it looks clear at the vent. She does have white poo residue sticking on her feathers. No coughing, wheezing, runny nose or discharge of any kind. I brought her into the house and she is in a dog crate. She still won't lay down on the hay in the crate. She is a Rhode Island red, about 16 weeks old. Free range. I have had chickens for a couple years, but never any sick ones so I am at a loss as to what is causing this. Any ideas?