^No, Jesco von Puttkamer (who was TMP's science advisor) wrote "The Sleeping God" in New Voyages 2. "Mind-Sifter" was by Shirley S. Maiewski. The two stories are profoundly dissimilar.
That's right, it was "Grandma Trek." She lived in a town near me...never got to meet her before she passed away.
Never read Star Trek Lives!, then, I guess... she was mentioned in there as one of the creators of Alternate Universe 4, which I remember thinking all those years ago was one of the more interesting-sounding fanzines discussed in that book. Found a copy of the second issue a few years ago but haven't read it yet hoping to find the first, and lo and behold, here it is.
I used to have Star Trek Lives! and read it several times (though I don't seem to have it anymore), but I guess I've forgotten the details.