You are asking attorneys to provide guidance about violating this country's immigration laws. Your mom should not overstay. She should depart in compliance with her authorized stay. You can always file an immigrant visa petition on her behalf after you have naturalized. Your mom should not file a request to extend her stay. She would be making a misrepresentation as she has no intention of departing the U.S. You can read more about family immigration at http://myattorneyusa.com/family-immigration.
Answered on Jan 24th, 2017 at 2:01 PM