Sonnett received call-ups for the United States women's national under-23 soccer team training camps in April and December 2013.[53][54] She later represented the United States as a center back at the U23 level during the 2014 Six Nations Tournament in March 2014.[3][55][56] Sonnett appeared in all three games, helping the team ultimately win the tournament title in the final against Norway.[57][58][59]