If you have unlocked Haven, and don't know what tablet dungeons are, it's not the game's fault... because she literally tells you to go check out the downstairs area, where the tablet dungeon plinth is.
I think I know what the problem was. She doesn't mention the plinth until you find the first resident, and I misunderstood the quest and was looking for a slime shaped thing to talk to.. Not a human. My bad.