Mabergs was the alternate on the Swedish team (skipped by Margaretha Sigfridsson) at the 2015 World Women's Curling Championship. Mabergs did not play any games and the team finished 7th. In the off-season, Mabergs joined the Anna Hasselborg rink. The team would go on to win a silver medal at the 2016 European Curling Championships and represented Sweden at the 2017 World Women's Curling Championship where they finished fourth.