I have a product called swat got it at the feed store. Thankfully I haven't had to use it though but it's to keep flies away. You may have to get close to treat she sure can't go far if you have her penned. It will cause stress to you both but be over in a few minutes. There is another product called Blue Kote that can be sprayed on wounds it has Gentian Violet in it and will turn anything it touches purple but it great as a wound healer and to disguise wounds.
Do you have any idea how this happened? @kyra359 like Amiga said I'd be working on trying to figure that out so it doesn't happen again.
