WHL) in the 2015–16 season, Fillier recorded 11 points in 22 games as the Hornets claimed silver at the Ontario provincial level.

[2] Bestowed the Jr. Hornets captaincy for the 2017–18 season, Fillier led the league in playoff scoring with 12 points in 10 games and at the provincial tournament earned MVP honours.

[4] Returning to the NCAA for the 2022–23 season, Fillier's 19 goals, 18 assists, and 37 points were the best totals on the Tigers, and included a hat-trick against Quinnipiac on January 29, 2023.

[4] In the 2023–24 season, Fillier scored a career-high 30 goals and 13 assists in just 29 games, leading her to be the projected first overall pick in the 2024 PWHL draft.

[10][11] The team won the gold medal, and Fillier finished second in tournament scoring with eight goals, including a hat-trick against Sweden in the quarterfinals.