I have one dominique in my flock that looks absolutely terrible (actually looks worse than this now). We are going on about 3-4 weeks now of this terrible look. I thought at first she was molting but her feathers are starting to look frayed and mangy and it's not going away. A few of the other chickens are starting to lose head feathers which seems like the start of the annual fall molt but otherwise look smooth and beautiful. Any ideas? I don't see any visible mites or lice. She's eating, drinking and interacting fine with the other girls. We don't have any roosters.