Fields played for Canada in the 2010 FIBA Under-17 World Championship for Women held in Toulouse and Rodez, France from July 16–25, 2010. She averaged 22.4 points and 6.9 rebounds per game. She scored 30 points against France and 36 against Japan. The following year, she played for the Canadian team in the 2011 FIBA Under-19 World Championship for Women held in Puerto Montt, Chile. She helped the team to a fifth-place finish with an 8–1 record. She averaged 15.9 points and 5.4 rebounds per game.