She also represented Norway at the
2021 European Women's U-19 Handball Championship, placing 9th. In July 2022, Brandbu Andersen and the rest of the
Norwegian junior handball team became World Champions after winning 31–29 against Hungary in the finale. On 8 April 2026, Brandbu Andersen made her debut on the
Norwegian national team against Romania, scoring four goals. ==Achievements==