I have an older ameraucana/ EE hen who has appeared to be molting for what seems like a long time. It started in May, and I originally thought an aggressive rooster was guilty of pulling her feathers off. Even after I removed him, her feathers were still ratty, so I thought maybe it was a molt. It has been at least four months now, and she still looks ratty. She is probably 5 years old or so, but still lays 2 - 3 eggs a week, even while looking ratty. We even dusted everyone with sevin dust and DE in July when the dogs had a flea problem. None of the other hens kept with her are affected. Any ideas what this might be?