I do not know why you are not responding, but you are not charged per question, per response, nor per answer. So after I give you my answer, you can continue to ask me questions without additional charge until you are satisfied. I apologize if it is a site issue that you posted and the post did not go through.
Believe me, I want to help you with this. Few things make me angrier in U.S. immigration law than someone that takes advantage of someone else to get a green card. The problem is that there are two very harsh penalties for this and because the penalties are so harsh, the evidence of fraud has to be solid. She will argue that the marriage just fell apart and that's why she left. So you will have to have solid evidence that her intent was always to use you for the immigration benefit.
The first penalty is under 18 U.S.C. § 1325(c) which provides a penalty of up to five years imprisonment and up to $250,000 fine for any "individual who knowingly enters into a marriage for the purpose of evading any provision of the immigration laws."
The second penalty is a permanent bar to ever getting a green card again. She could not do it even if she had U.S. Citizen children.
You can report marriage fraud in three different ways:
1) You can go to http://www.ice.gov/exec/forms/hsi-tips/tips.asp 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.
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