You should take your girls outside and use a hose-end sprayer mercilessly on them, especially on the undersides of the leaves. That will rid you of most of your spider mites. Of course, that will also wash away many of your deliciously smokeable trichomes. Maybe you should have kilt them mites before flowering.

Oh, well. Are you an incurably romantic/organic sort? If not, then douse them bitches's leaves, top and bottom, with pyrethrins (organically-discovered, anyway, even if synthetically produced).

Or, if you're an incurably romantic/organic anti-tobacco sort of nutjob, buy a satchel of Redman chewing tobacco, steep it into a tea, and saturate the little buggers with a toxic nicotinic stew.