@NotVerySmart
I’m not sure if AP Chem was the only AP she took before now, and even if it were, she is taking the harder APs. Her EC list may not be huge, but it does have dedication. Once again, not every admitted student to HYPSM has the “perfect profile” that we all aim for. There’s just not that many students.
Also, about the international status, international students in America are still counted as international, despite going to an American school. It’s true that regional adcoms read the application first, but they also get to consider your citizenship/visa status. Therefore, if the OP does not have a green card, she is still considered international and has a lower chance at admission. Because I’m an international in America, I’ve only researched my side, but I’m also fairly sure that you would be counted as domestic, except for state schools.