If she just used me to permanently live here, is there a way to take it back.
If she has her permanent resident status and 10yr green card, then she is set, and no "taking it back" based on the claims you stated.
She didnt have to stay with you this long, as soon as she had her green card, she herself could "sponsor" her family, without you, so if this is your main reason for this fraud thought, its without basis.
Perhaps this relationship, is like others regardless of immigration status, someone cheated, someone fell out of love and decided to split. Its sad to hear she would just leave her kids like that.
Here's a forum for immigration, they might be able to help. visajourney.com