Swimming. Builds a huge aerobic base. Gymnastics builds strength, power, agility, but it also is the source of a lot of injuries.

Tennis? She's almost too old. j/k If you really think she's got awesome hand-eye coordination, lightning fast reflexes, and sprint speed, then she would need pro training one on one a few days per week and group training a few days. (I played college tennis.) But, tennis is extremely competitive and the girls are huge. Have you seen Sharapova or the Williams' sisters?

-Robert

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"How wonderful it is that nobody need wait a single moment before starting to improve the world." ~Anne Frank