I'm not sure there is much you can do if they are both in Mexico. The prosecutor's office can't proceed with a case if they don't have a victim. Even if they did decide to proceed, they would have to extradite him which would also be a difficult task.
As for the immigration matters, you should speak with an immigration attorney regarding her plight.
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No. Not likely. Report the matter to the police in Mexico.
Law Offices of J Thomas Smith J.D., Ph.D 11500 Northwest Freeway, Suite 280 Houston, TX 77092 713-LAWYER-2 www.MyImmigrationLawyer.info NOTE: Responses are for the education of the community at large and is not intended to be "legal advice." No attorney-client relationship is established by responses or comments.