At the end of the season, she once again participated in the Junior World Championships, finishing sixth with the relay team and 27th in the sprint and pursuit.

[2] She immediately impressed in the IBU Cup, for example, achieving second place in the mixed competition in Kontiolahti with Sara Andersson, Emil Nykvist, and Henning Sjökvist.

Her first individual podium followed shortly after, as Heijdenberg secured third place in the sprint in Idre despite two shooting misses, thanks to a strong skiing performance.

[3] At the end of the 2023/24 season, she was called up to the main team for the World Cup in Oslo, where she immediately got into the points zone with 25th place in the individual race.

[4][5] At the last World Cup stage in Canmore, she improved her best result with a 15th place in the sprint.