[3] She competed at the 2020 Winter Youth Olympics, finishing sixth in the individual event and 17th in the sprint competition.

Niedermaier planned to compete at the 2023 Ski Mountaineering World Championships, but was unable to after requiring knee surgery.

[7] In 2022, she won two stages and the general classification at the Tour Cycliste Féminin International de l'Ardèche.

[7] She took the leader's jersey at the Tour de l'Ardèche after winning from a 83 km (52 mi) solo breakaway ride.

[2] She finished third on the second stage of the 2023 Tour Féminin des Pyrénées,[10] and won the Queen of the Mountains and young rider classifications.

[13] Niedermaier won the women's under-23 time trial event at the 2023 UCI Road World Championships.