she is magnificent, but...a question is asked:

it is more likely than not that she is Vietnamese American, not Vietnamese who has just been here for a year and immediately in high school, as she claimed...
Judging from the almost perfect English.  
It is possible that being extraordinarily talented in music, she is also extraordinarily talented in languages to achieve such an accent free manner of speaking, but...
I also detected some imperfection in her spoken English.
So it is possible that in Vietnam she belonged to that "privileged" class who received English training at a very early age, like 6 or 7 years old, if the family has fortunes, lessons and exposure to the language from native English speaking individuals or those that have super native linguistic ability like the scholars and language professors trained in the West.  Yes, I have met those rich kids...

Being talented, one has NO reason to tell anything but the truths about one's background.
What is the truth?
Also, her nose seems to be cosmetically altered.
But, we keep an open mind...