I just brought home three Rhode Island Red mixes today, and I am brand-new to hen-raising (for eggs). They will begin laying in about 10 weeks, and I am concerned about one of them. I noticed that her eye was shut for a few seconds at the seller's home, but then it opened and it looked fine so I didn't question it. When I brought her home, I realized that she kept scratching her other eye. She seemed very irritated with it, lots of squawking with the scratching. I also noticed that her comb is not nearly as red or advanced in growth as the other two, not sure if that has anything to do with it. I just went out to the chicken tractor to look at it again, and to take some photos, and realized that it is now beginning to swell. Is this a sign of respiratory disease? Should I quarantine her? Or does she have something in her eye? Not really sure what to do, any advice is appreciated! Below are pictures of her unhealthy eye and her healthy eye. Plus, you can see what the other chickens look like as there is one in the background of the second image.