Erin Cobb, of Pembroke, won the seven-figure payday in the "Jaws"-theme instant win game.
She said she plans to invest the money and take her family on a well-earned vacation.
"This is life-changing," she told the lottery. "We will make the most of it and will have some fun!"
Cobb elected to take the lump-sum payment of $650,000 (before taxes) rather than the annuity.
She bought the ticket at Stop & Shop, 125 Church St. in Pembroke. The store will get a $10,000 bonus for the sale.
Click here to follow Daily Voice Hopkinton and receive free news updates.