I vote for Princess Debut too. My 11 year old has played thru it 3 times.
- Imagine Figure Skater is by the same dev team as Princess Debut, and is pretty decent for an Imagine game
- Animal Crossing - cannot recommend this enough
- Nintendogs
- Pokemon Diamond/Pearl/Platinum - you can be a girl in this one, so that is a big deal
- Magical Starsign - you can also be a girl in this one, nice light RPG
- High School the Musical Making the Cut (1) is worthwhile for any little girl, but avoid the 2nd one like the plague. Mine has not played the 3rd one, but my understanding is that 3 is a variant of 1. Making the Cut has some great dress-up (Wombat fun), and is a slimmed down copy of Elite Beat Agents. Like EBA it has lots of unlockables, and it is not that bad. Looney Tunes Concert Concerto is pretty poor though. EBA is preferred, but she would likely appreciate HStM 1 more, and as I mentioned, it is not that bad.
- Harvest Moon Island of Happiness