In my experience, ICE typically doesn't do a lot of investigations into these types of allegations.
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You can write to ICE however it is their determination in the end.
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I think you should stay out of it! If you feel "bad" for the woman then reach out and help her. You may make things worse for her by doing underhanded matters. Of anyone, then she should leave the relationship or "report." this is not your place, unless you have other "considerations" you are not disclosing.