So one of my hens who is about a year and a half is acting sick. She will stand in one place for a long time with her eyes closed. I picked her up today and she puked water. She has been standing by the water can a lot. She started loosing feathers on her tail, then belly, and now her vent. Her skin isn't irritated at all. I don't know if she is laying or not. She has been isolating from the other girls when they are out in the yard. She is the only one who is being weird or loosing feathers as far as I can tell?? Anybody have this before?