Reptile Spray is a solution of salts that kills mites by quickly dehydrating them. It also stings like hell if you get it into an open wound. I don't spray it directly on my snakes, I spray a white paper towel and wipe them with it, let them crawl over it, etc. as it's less stressful for them than getting sprayed. Plus you can check the paper towel for mites when you are done.

Do you have her on PAM-treated paper for substrate or is she on aspen, cypress, etc.?