Due to Mexicans either crossing illegally or overstaying valid visas, it is fortunate that she obtained a visa. No doubt her family's money, her own good history of travel, and her own demonstrated compliance with visas worked in her favor. She can thank those countrymen and women, who abuse the immigration system, for the restrictions she now unfortunately has to face.
I would take advantage of this one stop / one state visa. I know it's not what you hoped for but it's still time together. It's time to show that she can leave and arrive on time. And, hopefully, next time, her visa will be granted for a longer time and with greater flexibility. I'm a silver lining kinda gal - enjoy your vacay and make the most it! Alternatively, since she travels all over the world and you are a US citizen, maybe travel to other countries.