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I would put together the evidence that you have against her and make the report to the local USCIS Field Office. Here is a link:
If she was convicted of domestic violence, this is a deportable offense and it does not have a waiver. So eventually she should be deported just on that offense. The shoplifting is a minor crime and normally would not cause a deportation. Not disclosing the existence of two daughters may not be material for the green card process because it may not have mattered if she had children or not as long as she was legally eligible to re-marry. But they may have decided to dig into her past to see if perhaps she was also married to the father of the children and because she omitted that, they could consider it material.
If you have any other evidence that you believe she married you only for the green card, I would submit that as well. If the evidence is strong enough, she would be permanently barred from ever getting Residency again, even if she had U.S. Citizen children.
Don't let her get away with violating the immigration laws.
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