Is she a bottom bird in the pecking order? You could try a no pick spray. I probably would spray the head with bluekote, careful of the eyes, than release her while it's still damp in case a wants to peck at the new color. It apparently taste awful when wet. The bluekote will help hide the red color which can attract chickens. You may need to apply multiple times as it wears off. I'd try that for a few weeks to see if it helps.
Dish soap will usually remove the bluekote from your hands. Might have to scrub a couple of times.