Once again your writing style completely cracked me up. "Floofing up my hair"!! 😃 Are you a professional writer perchance?
It has occured to me that perhaps Revo is off-label for Sarcoptes in the US. Sometimes label claims will vary from one country to the next. But it's not all THAT expensive - yes, it's our most expensive hwmed, but you wouldn't need an entire season's worth of doses, only a couple of months. That being said, the ivermectin will work, just a bit more of a hassle than an easy topical treatment.
Hope Mystic's feeling better. Did they tell you that as the mites are dying she can experience even more intense itching for a while? Just to forewarn you, lest you think the treatment's not working.