One point to add. I imagine that going to international school for the long term would be like being a military brat. Although you might stay in the same place for a long time, your classmates won't, so it is a constant process of making and losing friends. Going through school with the same people year after year is valuable.
Also, if they go through international school the whole time and then graduate, then what? They're, presumably, American citizen. In order to form a sensible life, they're probably going to leave mainland China, back to the U.S. where they won't know anyone and won't really understand the culture. Or at least to Hong Kong. They're not ever going to be accepted as mainlanders.
As I see it, China just doesn't have a good niche for half-Chinese American citizens who grew up there. They could scrape around for ESL work, I guess, if that industry still exists then, but fresh-off-the-boat Caucasians from Iowa will probably still be favored.
So I'd say bring your daughter to the U.S., where she can integrate fully into the society. Otherwise she could end up feeling adrift.
Food for thought: If a half-Chinese person grows up in China, as a Chinese citizen and going to local schools, can the person ever become accepted as a mainlander -- get a local job, marry a local, etc.? In my opinion, yes. There will be stares, but I think the Chinese hukou and the local-accent Mandarin would be enough to create acceptance. However, you rarely see this happen -- when foreign citizenship is available, the parents almost always jump on it.