I've got a 7 month old bantam cochin hen who has had poo stuck on her fluffy butt over the last couple weeks, but everytime she poops when I'm watching it looks normal. Last night we had our first realish (59F) cold front. She went out with her flock to eat this morning, but now her eyes are swollen shut, she's lethargic, and she appears to have some discharge from her mouth. She is mouth breathing. There has not been any sneezing, coughing, etc while I've been near her. I also know she's been laying eggs regularly. We do have a massive feral cat, opossum, racoon, and ready problem in the area and the chickens free range all day, so she may have been exposed to a wide variety of unfriendly pathogens. I would really appreciate any clues as to what this may be. The rest of the flock is acting normally so far, but this seems to have hit very quickly so I'm a nervous wreck now.