Non-existent Mexican accent?

She sounds American. I was thinking she was perhaps born in Mexico but moved to the United States at a young age but it seems she was a Mexican resident all her childhood and teens but she went to some fancy pants English language American style school in Mexico.

The American School Foundation of Monterrey is a private, nonprofit, international school located in Monterrey, Mexico, which provides a U.S.-type education to international and Mexican students. It is one of a few American-style educational centers in this city and is notable for being the oldest one of that group.

All instruction is in English except for Spanish classes. For grades 10th to 12th there are two courses of study, one leading to a Mexican bachillerato and the other to a U.S. high school diploma. Students can choose either to follow just the U.S. diploma or both courses. The option to do the Mexican bachillerato alone is not offered

For the 2021-2022 school year, the total enrollment comprised 2,454 students, 88% of which are Mexican, with the remaining 12% being American and of 15 other nationalities.