I have 4, 3-4 year old hens. One lost feathers around neck, chest and legs. Generally looks ragged. Otherwise seems healthy and happy. This has been ongoing for approx 6 months. I have not seen other hens pecking her, although there is no rooster in the group. Recently, her green eggs have brown spots making the eggs speckled. I feed laying mash with lots of greens and fresh water. I am in a hot, dry, desert climate. Their coop is 6' x 8' and their outside space is 10' x 20'. I want to bring a rooster and more hens home, but want to know what I'm dealing with here first. I would like to treat her myself, if possible. Suggestions?