[2] At the 2018 German Skateboarding Championship in Düsseldorf, Stoephasius became the German Champion in the women's park discipline at the age of eleven,[4] a feat she repeated the following year.

[5] She competed extensively in 2019, most notably in July at the World Skate Vert Skateboarding World Championship in São Paulo, where she placed third,[6] and in August at the Vans Park Series Europa Regionals in Chelles, France, where she won silver.

[11] At the Dew Tour Women's Park Open in Des Moines, Iowa in May 2021, she qualified as the youngest German athlete to ever debut at the Olympic Games.

[12] In September 2019, among the top thirty ranked women's park skaters, nine would have been under the age of 14 at the originally scheduled date of the 2020 Summer Olympics..[10] Stoephasius attends the Evangelische Schule Charlottenburg in Berlin.

[13] In 2019, Christoph Biemann filmed a segment for the bi-annual television quiz-show Frag doch mal die Maus ('Ask the Mouse') with Stoephasius' class after she submitted the question “If all of the students came to school by skateboard or bicycle or other CO2-free method, how much CO2 could the sixth class save?"