Please help- I have a white leghorn hen who seems to be getting congested. When she clucks or breaths it sounds blocked and congested, and she sorta snorts as if to clear her nose, and is kind of gasping.and making a rattling noise. What should I do? No weepy eyes and her comb, wattle, and poop look good. She layed an egg again this morning. I've seperated her for now- is it contagious? Thanks!