What I read somewhere (don't remember, maybe Valdemar Companion?) was that she found there were people trying to do the dark rituals & achieve the results she made up, so she sent Diana on a vacation to Babylon 5, where she was last seen expelled from an ill-repaired airlock, clutching her teddy bear. But if you look closely at "Jinx High", you'll notice the very young Tannim as a peripheral character. She got the idea from that, I guess, of linking her {Diana} more closely to the world Tannim inhabits, that of the racing elves. Then the would be black magicians would either have to give up and admit it's fantasy fiction, or believe the rest of it too. Elves, Kitsune, ghosts, dragons, elementals, the whole nine yards.