After falling short of making the 21 player World Cup roster, O'Hara was called up to replace Lindsay Tarpley who tore her ACL in a send-off match against Japan on May 14, 2011. O'Hara earned just one cap at right midfield in the 2011 FIFA Women's World Cup in the final group stage game against Sweden. The United States went on to win the silver medal in that tournament.