One of my Production Reds has a problem. Her eyes are squinty, and I don't know what is up with her. All the other girls look fine. She is fine in every other respect. Eating well, still laying eggs, keeping up with the rest of the flock. Some one suggested it might be parasites, I don't think so. I give my girls ACV. She shakes her head and scratches at her eyes. I wonder if anyone might have an idea what I can do for her?