If she's into mystery games, there's either Hotel Dusk (which is pretty film noir-ish) or Trace Memory (which is closer to Nancy Drew). Alternatively, you can get one of the Nancy Drew games for the DS (I think there's two of them out right now).
I also forgot to pimp Elite Beat Agents (an incredible rhythm game: look it up on YouTube to see if it'd appeal to her).
And Onyxmeth is right: the DS has several Sims games (how I managed to forget is beyond me).







