She has mites because she's ill. Her comb and wattles are still red, so not anemic, and probably why I didn't notice she was sick sooner.
I've only had problems with mites here on birds that are ill, old and dying, broody hens, and birds that can't take a dust bath properly.
The mites that are getting on me now are the ones crawling around on the outside of her feathers looking for another place on her to settle and re-produce, since I've found and broken up all the mite parties on her (hopefully, I'll keep checking).
I believe she has a bacterial infection, because her poo seems to indicate that.
Yes, DTE is diatomaceous earth. I used to use it.