Huitema made her senior national team debut at age 15 and scored her first international goal at 16, drawing headlines as a potential future star.

She did not sign a professional contract with the team, allowing her to maintain college eligibility, as she was at the time also weighing offers to play for Stanford University or UCLA in the NCAA.

[18] Huitema was also in the starting lineup for PSG's semi-final match in the International Champions Cup, they lost 2–1 to the North Carolina Courage.

[23] Huitema became the top Canadian scorer in the UEFA Women's Champions League before she turned 20, a record subsequently surpassed by Cloé Lacasse.

[27] She scored two goals in the remainder of the regular season, the second in the season-ending match with the Orlando Pride that saw the Reign clinch the NWSL Shield.

[29] Huitema made her first junior appearance for Canada with the national under-15 team on August 7, 2014, against Puerto Rico in a 5–0 victory at the CONCACAF Girls Under-15 Championship.

[40] In the second game, Huitema scored a hat-trick in a 4–1 win over hosts Trinidad & Tobago, which clinched Canada's progress into the semi-finals.

[43] Canada would require a win over Haiti in the third place match to qualify for the FIFA U-20 Women's World Cup in France later in the year.

[56] Huitema would start the second match for Canada against Russia, drawing a first half penalty which was converted by captain Christine Sinclair, the lone goal in a 1–0 victory.

[57] Huitema was selected to make her FIFA Women's World Cup debut after being named to the Canadian squad for the 2019 edition in France.

"[17] Huitema made one on-field appearance during the tournament, starting in Canada's 2–1 loss to the Netherlands in the group stage and playing the full 90 minutes.

[62][5] While Huitema's junior career and early debut with the national team had drawn widespread hopes that she would serve as a long-term replacement for Sinclair as Canada's elite striker, her lack of production against top opponents in the years immediately following the Tokyo Olympics began to generate discussion.

[25][23][63][64] Named to her second World Cup team in advance of the 2023 edition in Australia and New Zealand, sports channel TSN noted "there is a lot of pressure on Huitema to take the next step forward.

"[23] Canada would ultimately fail to advance past the group stage in Australia, scoring only two goals in three matches, which renewed discussions about the team's lack of offensive ability.

[65][66][67] Huitema recorded no goals or assists in the tournament, with assessments of her performance being mixed overall, disagreeing as to whether other attributes were sufficient given the lack of finishing ability shown.

[72][73] She scored her third goal of the tournament in the semi-final against the United States, an equalizer that would ultimately send the game to extra time, and subsequently to penalties.