J.B.
I lived in Mexico for several years and all the kids I knew spoke English because they went to "American" school, even though their parents were only Spanish speakers. What the schools did was teach some subjects totally in English. Others were in Spanish. I know first hand that this model works well and they all started in these types of schools as kindergartners. So I would find out their approach. Maybe they will do something similar and have part of the day French and part English. I knew some children in Mexico whose mom's first language was Hungarian. They kids spoke Spanish all day bc they lived in Mexico and actually thought the Hungarian they spoke with their mom was a special way to talk their mommy, they had no idea it was another language. So I totally think she will do great with it. I was actually on the phone today with a friend from Mexico and my son was super excited when I got off the phone and wanted to know all about the words I was saying. So I think she will do well:)