Is it true that Mexico denied her re-entry? The source article doesn't say anything about that, and I'm not sure why it would happen - Canadian nationals generally have visa-free entry for short trips to Mexico.
She gambled on trying to to game the immigration system and lost. It sucks but 12 days in custody isn't world ending. The most amazing part to me is people with no experience with "the system" find themselves incarcerated and think not eating sounds like a good idea.