I don't know about NIX.
But, for PAM you can spray the bedding in the tank/tub and then let it dry. It'll kill all the mites in the tank/tub and also on her. You could, if you wanted to, soak her in water for a few minutes. Mites can't swim and will drown. If shes covered then I'd order the PAM now and start soaking her every day for 5 minutes per day just to keep them under control. Once you get the PAM and spray the inside of the tank/tub you won't need to worry anymore. I wouldn't wait though, the mites do hurt your snake and the stress has been know to cause Ball Pythons to stop eating for long periods of time.