Oberheitmann said she noticed while inside the store that the Powerball jackpot for the Sept. 9 drawing had grown to $500 million.
"I typically only play when the jackpot gets big," Oberheitmann said.
She bought a ticket and continued the journey home, where the couple later learned the ticket had matched all five white balls in the drawing: 11-19-29-63-68.
Oberheitmann and her husband made a second trip to Virginia to claim their prize at the lottery office in Hampton.
"We'll probably stop at the store on the way home to take a selfie," she said.