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I am sorry about your situation. You certainly have rights but the challenge is enforcing them in Mexico. You need to file what is called a motion to enforce your mediation agreement to honor the terms of your agreement. You should also fole for a modification to at least 50/50 custody. The court might consider it if you have been clear of any criminal issues.
If you can get an emergency hearing with the judge and a signed order then you could then see if the Mexican government will enforce it.