For the past two or three days, my Salmon Faverolles hen has been a little distant and lethargic. She was still dustbathing, eating, drinking, and her droppings looked normal, so I didn't think of it as anything serious. But this morning, her comb is pale and dry looking, she has lime and emerald green diarrhea, and doesn't seem interested in food or water. I separated her from the flock, gave her layer pellets and water even though she doesn't seem interested in it, and cleaned out whatever poop I could from the run to help keep other birds from catching it as minimal as possible. I've been reading online about it, but I'm getting different diagnoses and treatment options from each site, and I don't know what to do. What is this illness? Is it contagious? Lethal? What do I have to do to treat this? What do I have to do to prevent this from spreading? I appreciate getting answers, I don't want something to happen to anyone in my flock. Thank you so much.