Possible spoilers? Is she just a random denizen of Malmouth or is she an important character? I apologize if this has been stated already elsewhere. Thank you!
If you’ve not finished the campaign and you’re asking it you should probably do that first.
If you have and not yet found her, well then you could probably wait for an answer since neither have I finished it yet. I assumed it was one of the witches in Ugdenbog but I could be wrong.