This is interesting. Thank you for tagging me. Last night, we got into the low 70's and I didn't hear her breathing. I believe it's aggravated by different things (temps, humidity, etc) and likely flares up at times, similar to any chronic condition. I did find an avian vet, but they're about 2 hours away. If Darla (my Buff Orpington) gets worse, I'll be taking her in and I will definitely share any findings with you. I do plan on ordering the Oxine that's been mentioned several times. Didn't you say that spraying this around your sweet girl has helped? I need to look around and find this product. Is there anything particular that I need to look for (any specific strength, or anything specific?)? Does your hen have a noticeable wet mouth when she's doing this? Darla isn't drooling by any means, but I've noticed her mouth does seem more moist than normal. It's not alarming or anything, just something I took note of. Darla will run (actually a very fast waddle) around, gets very vocal around laying time, and does everything else all of my other chickens do, but when she breaths like that, my stomach sinks. She seems healthy otherwise, knock on wood. So that's why I haven't brought this up. I really appreciate you bringing it up. Hopefully both of our girls can breathe easier and go back to being perfect (in our eyes at least <3)