de Val played in the World Junior Curling Championships in 2014, 2017 and 2018 as a member of Team Isabella Wranå. In 2014, her team of Isabella Wranå, Jennie Wåhlin, Elin Lövstrand and Fanny Sjöberg had a fourth-place finish, after they lost in the bronze medal game to Russia. de Val was the alternate on the team but played no games. She was back at the event in 2017 as the official second of the team, replacing Lövstrand. The team made it all the way to the final and defeated Scotland's Sophie Jackson to win the gold medal, and lost just two round robin games in the process. The next year the same team went undefeated in the round robin, but ended up losing to Canada's Kaitlyn Jones in the final. This team also represented Sweden at the 2017 Winter Universiade, where they took home the bronze medal, and again in 2019 winning the gold medal. de Val represented Sweden one more time at the juniors in 2019 as the fourth for Tova Sundberg who threw third stones. They placed sixth.