I would get witness statements, emails, letters, recordings, anything you can get to prove that she just married you for the green card.
You can report marriage fraud in three different ways:
1) You can go to http://www.ice.gov/webform/hsi-tip-form and file the report there.
2) You can call the ICE hotline at 1-(866)(###) ###-####
3) You can contact the local USCIS field office by going to http://www.uscis.gov/about-us/find-uscis-office/field-offices
You should have evidence of the marriage fraud handy in case they want to ask you questions or have you send evidence to them.
I hope you can prove it. She deserves to be deported.
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