I would treat her enclosure, hides, and paper towels as described in the instructions. Mite eggs can take several weeks before they hatch. If you had the snake for a week before noticing the mites, chances are her enclosure has eggs in it already.
If you really want to learn more about mites... http://denardo.lab.asu.edu/publicati...snakemites.pdf
The article explains in great detail exactly why mites "keep coming back" weeks after snake owners think they've been eradicated. If you don't want to read through the initial pages of snake mite life cycle, physiology, and behavior, just read pages 8-12 where the article discusses various treatments and how they are best used.