There are lots of easy to use apps for making music (if this is something that is likely to appeal to your daughter) including magic piano and beatwave. Garageband is great too but I'm not sure how accessible it would be to a 9 year-old.
Art of glow is quite absorbing if she is arty and there are numerous other drawing programmes in the app store.
I don't know much about games as I don't play them too much, but I quite like cro-mag rally. I don't know if it's really aimed toward 9-yr-old girls but my 7 year old niece loves it.