So I called her back. Mostly out of curiosity, partly because it has always bothered me that we just abruptly stopped talking.
It was nice. We spent 90% of the conversation about our families, and what we'd been up to. I did tell her nicely that I was sad that the MK thing didn't work out for me, maybe I didn't know enough people, or maybe there's just too many consultants in this area. She was really sweet about it. She didn't say a word about wanting me to join again or anything.
I did mention something about the mineral makeup, and she said about how I could get some of my old customers together and have a class. Uh, yeah, I'll get back to you on that.

All in all it was a nice chat. She's putting me on her email list, maybe PCP, and I don't have an enemy out there in the world. I feel better about the whole thing. Still hate MK, but not this person.