Amy Polk, pictured here with sons Adam (left), Brian and husband John, died Thursday in a fatal pedestrian crash in D.C.. A family spokesperson has confirmed that the woman who died in a pedestrian crash at First and M Streets SE on Thursday was Amy Polk, 42, of Takoma Park, Md. Polk is survived by her husband, John Robinette, and her two sons, Adam, 7, and Brian, 4. A private funeral will be held…