Sometimes it's difficult to separate one hen from the flock as they miss being with their group so much. If there is an open wound, it is a good idea to camouflage it. You can use Blu-Kote with a q-tip, or a little Rooster Booster Pick-no-More, though it would be difficult to get any of that on a place like you're describing without getting at least as much on yourself. I would watch closely, and if there is more picking on that area, I would separate them in such a way that they can see or maybe hear each other. She wouldn't be so lonely that way. A darkened dog/cat carrier will sometimes help settle an injured bird down. Good luck with your bird. Hopefully there wasn't any more pecking to that area.
