There's a half-eaten gnome in the area, one that the insane drow guy apparently was fed when he was nursed back to health by his 'friends'. That could be her. But it would have to be relatively new. On the other hand the stuff with the three drow seems like it's written as having happened quite some time in the past (the deal with the memory stone fading, for instance) The timeline of a lot of the stuff in the underdark seems a bit confusing to me, to be honest.
