@ronotti1--no mites or lice (she was never infected), plus I just rechecked again today. and no, the protein isn't helping--though all girls are super shiny right now!
@SallyinIndiana--I only have three hens, thus my continued over-worry...I think if I had more, she'd be stew for sure!
The weird thing is the spot hasn't gotten much bigger since it started in the spring--it looks worse, but only because now there's trace blu-kote involved and because the little feather pins are picked right to the skin, instead of to nubs, in places. If it were lice or mites, it would've spread in 6 months, right? Both other girls are fluffy (other than the moult), she's the only one with the marks. I've never caught her over preening or being pecked by the others and since there's only three of them, and I'm home all day, I'm pretty sure I would've seen something by now. My only guess is that she's doing it at night.
I guess I'll just leave it and see--she's otherwise fine and I can't find anything definitive out there to solve it...
thanks for the feedback.
This sure isn't a permanent solution but you could put one of those head cones on her to stop her from picking for a while... just make one yourself out of some cardboard, light weight cereal box cardboard... If she picks because she's neurotic maybe she'll stop if she can do it for long enough... Maybe she will forget about the habit