How about that Modnation Racers game? Never played it apart from a bit at the store but it seems like a nice Mario clone. Definitely recommend Wipeout and Lumines, and if she wants a fun adventure/platformer hybrid, Gurumin would be a really good pick. Locoroco is another good one, maybe Patapon? Genesis Collection if she has a taste for the retro (she'll love the Sonics and Ristar). I wouldn't recommend Prinny to her, since it gets insane in terms of difficulty in the later levels. Kingdom Hearts if you don't think that would be too RPGish for her.