If you are talking about stomatitis, it is normally caused by improper conditions, with too cool and too wet being the main culprits. It looks like white cheesy material around the gums and lips, and can get bad fast if still in poor conditions. If your snake has obvious wounds around the mouth, or is exhibiting signs of respiratory distress, I'd get her to a vet sooner than later.

I hope it's nothing to worry about.

-Evan