One of our hens is sick, of that I'm certain... I just don't know what it is, so I don't know how to help her. She's 2-3 year old barred rock. I noticed a couple weeks ago that she was walking around with her mouth open, panting, and that her comb and waddle look very, very pale pink. I tried making sure she ate, and that her crop wasn't clogged, since we had that issue before. Now, her comb and waddles are still pale, she walks sort of hunched over, squinting, and doesn't drink much. She eats, but she refuses to drink. She's lost weight, and she sneezed just a few minutes ago... That's when I decided I had to ask for help. What I tried isn't really working, and I need to help her. I know respiratory issues can kill birds fairly quickly, and I don't know how to figure out exactly what's wrong, or how to deal with it.