Ok, so i'd like to get my little sister ...

Ok, so all of my older bros are really anoying, so i'm trying to get my sister to like games so i can play with her instead of them. She's nine and a half, and what i would classify as ''casual''. She occacionaly plays Nintendogs, Ponnie Freinds, Wario Ware, Wii Sports, Wii Play, Brain Age, Big Brain Acedemy, Pokemon Mystery Dungeon, and Pearl(I do almost everything on the pokemon games for her). Besides those, i have: TP, MP3, SMG(Lol, Sub Machine Gun), MOH2, Super Monkey Ball Banana Blitz, Super Paper Mario, SSBM, New Super Mario Bros, SM64DS, and PH. I also reserved Brawl. Any suggestions?