[5] Erichsen competed at the junior level of the 2016 European Championships with Sara Davidsen, Edel Fosse, Julie Soederstroem, and Juliane Toessebro, and the team finished 16th.

[7] Erichsen made her senior international debut at the 2017 Northern European Championships in Tórshavn alongside Ingrid Hafenbrädl, Julie Madsø, Thea Nygaard, and Martine Skregelid where they won the team gold medal.

[8] At the 2018 Unni & Haralds Trophy in Oslo, Erichsen finished sixth in the all-around, and she won the uneven bars silver medal.

She then competed at the 2018 European Championships with Sara Davidsen, Edel Fosse, Thea Nygaard, and Julie Soederstroem, and they finished 21st in the team qualification round.

[12] Her final competition of the 2018 season was the 2018 Voronin Cup in Moscow where she won the bronze medal on vault behind Yeo Seo-jeong and Elina Vihrova.

[16] At the Norwegian Championships, she defended her vault title, and she finished fourth on the balance beam and fifth in the floor exercise.

Prior to the Olympics, she competed on the uneven bars at the FIT challenge and helped the Norwegian team finish tenth.

[25] Then at the 2022 Northern European Championships, she helped the Norwegian team win the bronze medal behind Wales and England.