the 2014 FIFA U-20 Women's World Cup in Canada. At 16, she was the second-youngest player on the Canadian roster. She made two appearances (against Ghana and Finland) in the group stage of the tournament, before playing all 90 minutes in the quarter-final against Germany. In December 2014, she was named Canadian U-17 Player of the Year. Fleming also represented Canada at the 2015 Pan American Games, where the Canadian Soccer Association fielded an Olympic Developmental under-23 squad. She played every minute of the tournament, scoring an 88th-minute penalty in the bronze medal match against Mexico, which Canada lost 2–1. In December 2015, she was named Canadian U-20 Player of the Year. Senior 2013–14: Senior debut In December 2013, following her performances at the CONCACAF Women's U-17 Championship, Fleming received her first call-up to the senior national team, ahead of the 2013 Torneio Internacional de Brasília. On December 15, she made her senior international debut at the age of 15 years and 278 days, when she replaced Brittany Baxter in the 72nd minute of a 1–0 defeat to Chile at the Estádio Nacional Mané Garrincha. Fifteen minutes into her debut, she received her first yellow card. At the time, she was the second-youngest player to ever play for the national team; as of 2021, she is the third-youngest, after Olivia Smith and Kara Lang. A week later, she made her first start in a 1–0 win over Scotland, and was replaced at half-time by Kaylyn Kyle. In 2014, Fleming made six more appearances – three as a starter and three as a substitute – for the senior national team, all in friendly matches. 2015–16: 2015 World Cup and 2016 Summer Olympics In early 2015, Fleming moved to Vancouver to train full-time with the national team ahead of the 2015 FIFA Women's World Cup. In January, she started all three matches at the 2015 Four Nations Tournament in China, which Canada won. On March 4, 2015, Fleming scored her first senior international goal in a 2–0 win over Scotland at the 2015 Cyprus Cup. On April 27, 2015, Fleming was named to the roster for the 2015 FIFA Women's World Cup; at the age of 17, she was the youngest player on the Canadian team. On May 14, she scored the only goal in a behind-closed-doors friendly against Mexico, which Canada won 1–0. On June 15, she started Canada's final group