My 9-month old Barred Rock has been coughing for the last five or so days. She also opens her mouth to get air. I bought some VetRx for chickens and have been rubbing it on her comb, beak, and wattle. Today is day 3 and I can't really tell if it's getting any better. I took this video yesterday. Can anybody tell what this is and if I'm off base on how I'm treating it? Thank you!