First of all, I was just expressing my own opinion, take it or not, it's her choice, and I will be happy for her either way.
You can post what you think but don't argue with me about my opinions because it has nothing to do with you.
Although I didn't catch that she is going to BU for Phd, still not sure if that is true, she did not say that she wants to stay in the States for sure, why would you say that for her? And are you an international student? If you are, you will know that China actually has a big market right now, and tons of people are heading back for the profitability that it provides. (And not that BU is bad, but Yale has a stronger reputation than BU in the States as well.)
Most importantly, who are you to judge me that I don't know Chinese? I live in California and 90% of my friends are Chinese and half of them are international students, 3 of my best friends work in China right now. I, myself, go back to China for vacation, have relatives living there, and watch Chinese news...don't want to give you a list to introduce myself but... what I mean is, you don't know me, you can have different opinions on stuff but don't judge me. Feel free to express your own thought because this is what this forum is for, but please be polite and friendly.
Last but not least, about the money/tuition, it just an observation that Chinese families pay for their children's tuition, unlike most of the American families where students need to work their way thru, it's just a culture difference. And also an observation that most international students are well off because poor people in China wouldn't bother to come to the States, and not to mention that people in China are growing the wealth rapidly nowadays, even the middle class can afford full tuition here. But again, it's just my own observation in my community or friend circle. If you see different, I am happy to hear.