She's not white, so she shouldn't be representing the US. That said, if she wants to represent China, her US citizenship should be revoked and she should not be allowed back into the country. She can take her chink mother and race mixing father with her.

This is why:

"Gu, a US citizen, made her decision with input from her Chinese mother, Yan, an outspoken “Tiger Mom,” and an American father who keeps a low profile, said one of her former coaches."

Mom pushed her to do it. "China-pride." But, yet, her mother came here, married a white man, and made a ridiculously gorgeous daughter (this often happens when handsome white men make daughters with beautiful Asian women).