Hi,
No wood mites shouldn't hurt your snake at all. People just tend not to like having bugs in the enclosure.
To reassure yourself they are wood mites you can also wipe the snake down with a wet paper towel - reptile mites would be drinking her blood and pooping on her so, when their droppings are on wet paper down they leach out brown. If any dots or powder do not produce brown rings after ten minutes or so on the paper towel they won't be mite droppings.
dr del