Without anything but the quoted line, I would say she's an American citizen, born in America, to the parents of immigrants.

In the USA, even before Trump, people were often identified by their ethnicity, or somethings just skin color, because with a few exceptions, we don't have families that have been here for hundreds and hundreds of years, like most other countries. Go to Europe, Africa, Asia, you can find people who's family has lived there since beyond the ken of mortal man.

In South America and Australia, I believe, this is less true, but more than here in the US.

In Antarctica, I'm not aware that the penguin flocks move around much.

Americans submit have no roots the way others often do. And I'm speaking as someone who can trace one side of my family back 15 generations to before the state we live in was a state.