When I look at her profile page, it says, "Offline right now. Last seen exploring Bailestorth Shin Quarter, 4100 block," and she doesn't seem to have been around for the last three months or so. My guess is that her housing info hasn't changed because she hasn't gone to her new house yet.
We still have the old houses in the game for the moment, but some are still "tied" to the old owners (and hence, no For Sale sign), and is something we are aware of. :)