You need to submit the requested documentation. The U.S. Embassy needs documentation that your wife actually resides in the U.S. Given the length of time she spent outside the U.S., she is lucky she was not found to have abandoned her residence. Your wife should contact an experienced immigration attorney to discuss what documentation can be submitted. You can read more about family immigration at http://myattorneyusa.com/family-immigration.
Answered on Dec 12th, 2016 at 4:01 AM