This woman had legal advice not to try to cross into the US from Mexico. She did not have the required documents for her visa application. This is entirely a self inflicted wound and she's at best stupid for not listening and at worst a total moron. As a Canadian, you are entitled to go into pre-clearance at the airport or border crossing and get your visa sorted out. If it's wrong, they send you home to Canada.
She flew to Mexico and tried to walk across the busiest land border crossing in the world, where they deal with 100s of fake immigrants every day. She was asking for trouble she got it.
I used to work with lawyers and this woman is a moron who got exactly what was predicted would happen to her. This is a US politics topic and should move to that thread.