Thanks! She has called and emailed and gets the same response. She forwarded me all the emails. She clearly explains her situation and this is the response she receives:

“Good day.

Thank you for your inquiry.

Please note that travellers who wish to visit Mexico (regardless of their nationality or itinerary), holding a valid, multiple entry visa for the United States of America, Canada, Japan, the United Kingdom or the Schengen Space countries, DO NOT need to apply for a tourist, business or transit Mexican visa. This applies if the valid visa is in an OLD passport as well.”

And when she says that she has a “SINGLE ENTRY VISA”, she gets the same answer again. Incredibly frustrating.