I have a hen that has been making a squeaking noise for a little while now. We had changed feed and she eats with a lot of enthusiasm. She dove in and came up covered in feed and coughing. That's when the noise started. Kind of a high pitched squeak. My daughter just brought her up to me saying she was breathing hard. I listened and she is wheezing quite a bit. I haven't noticed that she is off her feed at all and no diarrhea. She is also recovering from a particularly wicked molt and is covered in pin feathers. I'm worried about her not being warm enough along with a possible case of aspiration pneumonia. I'm new to chickens so I'm not even sure if that's possible. Any help would be appreciated. Thank you.