She can't. Mexico has one of the strictest immigration and foreign residency policies in the world.
Foreigners cannot vote, they cannot protest the government, they cannot serve in government jobs, and they take a back-seat to Native-born Mexicans when it come to housing, food, shelter, etc.
Mexcio puts Mexican citizens first. In fact, their Constitution specifically outlines that Mexicans are protected to preserve the Mexican state. If we did the same thing, we'd immediately be called racists and white supremacists.
Plus you damn sure that Mexico treats Guatemalans who try to cross the border like the invaders they are.
Just unbelievable that nobody on our side, not even Trump administration, is touting this hard fact.
Mexico is not our "ally." Never has been, never will be. They are to us what North Korea is to South Korea.
Far from being an ally, as a “neutral” country during WWII they hosted German spies.