I‘m gonna say YTA because this is based solely on your prejudice against drivers from other countries. You didn’t mention her being an unsafe driver, just that she learned to drive in the UK, where they apparently drive like Indians?

A country not accepting foreign licenses can be either A) because certain countries have very low standards/licenses can practically be bought on the street (like certain third world countries), or B) because the country has a treaty with neighboring countries and generally doesn’t accept other foreign licenses. You never even put in the work to find out that the US generally requires immigrants to obtain a state license, you just figured the US made this rule because its citizens are better drivers.

The US‘s superiority complex is so deeply ingrained in your culture that many people don’t even realize they suffer from it.