My chicken has been breathing noticeably louder for the past few days (kind of sounded like a broken radio/static; rattling?) and yesterday had mucus running our of her nose. Today, in the evening I discovered she started getting swollen around her eyes and they were also quite watery. What kind of disease has these symptoms? I've looked around on the internet and it's hard to pinpoint what exactly she has because every website says different things. She's also become less active but still lays eggs. She hasn't lost any weight either. I am very worried because these symptoms apparently mean she might die soon. I am also unsure of where to get help from because there are most likely no vets around my area that treat chickens. Help would be much appreciated!