In May 2019, McDonald was named to the final roster of the United States 23-player squad for the 2019 FIFA Women's World Cup. She made one appearance for the team at the tournament, as a half-time substitute in the teams 3-0 group stage win over Chile on June 16. She did not feature in the teams remaining tournament fixtures. She became a World Cup champion on July 7, 2019 following the teams 2-0 win vs Netherlands in Lyon, France.