The real question is whats your objective in doing this? If what your alleging is true, then she comitted a fraud on USCIS. Anything you write, show or say to them is going to be viewed with a high degree of suspicion since you are an interested person. Your motive will be judged on revenge and as an ulterior one instead of objectively trying to clarify the issues. The VAWA Unit is located at the Vermont Service Center, www.uscis.gov (chek there for the address). I don't think it is going to bring you any closure and the result you may seek. The VAWA unit keeps the information on victims confidential.