On May 2, 2019, Sonnett was named to the 23-player roster that represented the United States at the 2019 FIFA Women's World Cup. Sonnett earned one cap in the second group stage game against Chile, entering the game at the 82nd minute to replace Abby Dahlkemper. The United States went on to defeat the Netherlands 2–0 in the final, winning back-to-back World Cup titles and the fourth overall World Cup title for the United States women's national team.