Checked for lice and mites, treated with permethrin initially just to be safe. Seems like the feather loss is getting worse not better. Bought some Blu Kote, going to get it on-her when she goes to roost. She and one other gal seem affected, the other mostly around her tail feathers. Flock of 12, plenty of room, no one else having this problem. No mites or lice seen and I have been checking the coop at night. They are both spunky like usual. Thoughts?