We had a respiratory disease a couple of years ago, but she was just a chick at the time and was never exposed to it. She was introduced to the flock about a year ago, but none of my chickens have shown any signs of respiratory disease since the initial incident. When it first started, I remember many of my chickens having swollen faces too, but they also had other signs like nasal discharge.
So far, the swelling around the eyes is the only symptom. But since I've had a respiratory illness in my flock before, it definitely worries me. It might be hard to tell in the pictures, but she definitely has a little swelling around her eyes. I'll keep an eye on her and see if anything changes.