Schwaller first represented Switzerland on the international stage at the 2019 European Youth Olympic Winter Festival as third for Jan Iseli. At the festival, the Swiss team with second Maximilian Winz and lead Malin Da Ros posted an undefeated 6–0 record to qualify for the playoffs.[2] They defeated Hungary in the semifinal before losing to Great Britain in the final, settling for silver.[3] The next season, the same team returned to represent Switzerland as the host team at the 2020 Winter Youth Olympics in Champéry. Drawing on their past experience, the squad again went undefeated in the round robin to reach the knockout round.[4] However, in the quarterfinals, they gave up a steal of two in the eighth end to lose to Russia 7–5, eliminating them in sixth place.[5] Schwaller later competed with Hungary's Lőrinc Tatár in the mixed doubles portion of the event, however, the pair were eliminated after losing their opening game.
For the 2021–22 season, Schwaller joined the Grasshopper Club Zürich junior team as their new skip.[6] In September 2021, she led her team of Malin Da Ros, Marion Wüest, Selina Gafner and Sarah Müller to victory at the Swiss junior trials, qualifying the team for the 2022 World Junior Curling Championships in Jönköping, Sweden.[7] Before Worlds, the team won the Swiss junior championship, securing their spot as the Swiss national team for the 2023 world championship the following season.[8] They also finished third at the 2022 Swiss Women's Curling Championship. At World Juniors, the team had mixed results. Sitting 3–4 with two games left, they stole in an extra end to defeat Japan's Sae Yamamoto and then beat Latvia's Evelīna Barone in their final round robin game. This left the team tied for fourth in the standings with Sweden and Latvia. As all the teams held 1–1 head-to-head records against each other, draw to the button was used to decide the final qualifier.[9] Sweden advanced to the playoffs with a 40.56 draw while Switzerland finished fifth with a total of 47.42. Malin Da Ros stepped back from competitive curling following the season and Sarah Müller left the team. They were replaced by Fabienne Rieder and Selina Rychiger respectively.[10]
Team Schwaller began competing in more women's events during the 2022–23 season while still junior eligible. The team played in the 2022 Women's Masters Basel where they went undefeated until the quarterfinals where they narrowly lost to the Silvana Tirinzoni rink 4–3.[11] They continued their momentum into the rest of the season, going undefeated to claim the Match Town Trophy in October and the St. Galler Elite Challenge in the new year.[12][13] They also won the OVCA U21 Junior Superspiel in Ottawa, Ontario, defeating many of the top ranked Canadian junior teams in the process. In February, the team represented Switzerland at the 2023 World Junior Curling Championships where they were dominant through the round robin, qualifying for the playoffs with an undefeated 9–0 record. In the semifinal, they faced Japan. After controlling most of the match, the gave up three points in the tenth end to lose 7–5. They could not recover in the bronze medal game, finishing fourth after an 8–5 loss to Norway.[14] The next month, the team turned things around by once again going undefeated to capture the 2023 Swiss junior championship, qualifying for the 2024 World Junior Curling Championships the following season.[15]
To begin the 2024 part of their season, they went undefeated until the final of the 2024 Cortina Curling Cup, falling 6–4 to Turkey's Dilşat Yıldız.[22] They then played in the 2024 International Bernese Ladies Cup where after a 3–2 round robin record, they defeated the world number one ranked Team Silvana Tirinzoni in the quarterfinals before losing out to Korea's Gim in the semifinals.[23] Next for Team Schwaller was the 2024 Swiss Women's Curling Championship where they again beat Tirinzoni in the round robin, along with Corrie Hürlimann and Roxane Héritier to finish 3–1 and qualifying directly for the final. There, they could not beat Tirinzoni for a third time, losing the match 5–4 and settling for silver.[24] Their success throughout the season made them the highest ranked team headed into the World Junior championships in Lohja, Finland. For the second straight year, they finished 9–0 through the round robin, again earning the top spot in the playoff round.[25] They then beat Canada's Myla Plett in the semifinal before securing the gold medal with a dominant 10–3 win against Japan's Momoha Tabata.[26] With the amount of points cumulated throughout the season, Team Schwaller became the first junior team to qualify outright for a Grand Slam of Curling event.[27] At the year-end 2024 Players' Championship, the team finished with a 1–4 record, defeating four-time Canadian champion Kerri Einarson 6–4 in their sole win.[28]
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