hm, what kind of substrate are you (or the breeder) using ? Don't those small white bugs come from some kind of wood chips substrate ?
They aren't snake mites, though. I don't think ??
Clean the cage thoroughly, let the snake soak in some lukewarm water (not deep, only halfway up the snakes body) and let her crawl through some damp towels. If those bugs aren't snake mites, they should be easy to get rid off, possibly without chemicals.
But I'm guessing...