[1] Stern first represented Switzerland on the international stage at the 2012 Winter Youth Olympics where her team of Michael Brunner, Romano Meier and Lisa Gisler won the gold medal.

The 2018–19 season was a breakout year for Stern and her team of fourth Briar Hürlimann, second Lisa Gisler and lead Céline Koller.

They missed the playoffs at their next three events, the 2019 Stu Sells Oakville Tankard, the 2019 AMJ Campbell Shorty Jenkins Classic and the inaugural WCT Uiseong International Curling Cup.

They successfully defeated Eve Muirhead in the quarterfinals, Silvana Tirinzoni in the semifinals and Rachel Homan in the final to win the event.

Team Stern surprised many when they upset the defending world champion rink Silvana Tirinzoni in the 2020 Swiss Women's Curling Championship three times and defeated them in the final 6–4.

The team was set to represent Switzerland at the 2020 World Women's Curling Championship before the event got cancelled due to the COVID-19 pandemic.

[13] Stern and her team ended their season at the 2021 Champions Cup and 2021 Players' Championship Grand Slam events, which were played in a "curling bubble" in Calgary, Alberta, with no spectators, to avoid the spread of the coronavirus.