Dunn has competed on behalf of the United States in various national youth teams from 2008 through 2012, including at the 2008 FIFA U-17 Women's World Cup. She played in 14 international matches for the U-20 national team in 2010 before playing in every minute of the U.S.' five matches at the 2012 FIFA U-20 Women's World Cup, in which they won. She competed at the 2010 FIFA U-20 Women's World Cup in Germany and was a member of the team that won the 2012 FIFA U-20 Women's World Cup in Japan.