Solberg-Østhassel started playing handball at Helset IF, and later signed for
Stabæk IF in the highest Norwegian league, where she played with her sister,
Sanna Solberg. In 2011, she reached the final of the Norwegian cup with the club, where they lost to
Larvik HK. In 2014, she joined Danish side
Team Tvis Holstebro. Here she won the
EHF European League in 2015. In the summer of 2016, she joined French team
Issy-Paris Hand. Two years after she joined Hungarian side
Siófok KC. In 2020, she joined league rivals
Győri ETO KC. Here she won the 2021 Hungarian Cup, the 2022 and 2023 Hungarian league and the 2024
EHF Champions League. In 2023, she took a break from handball due to
maternity leave. In 2024, she returned to Norway to join
Vipers Kristiansand. She left the club again only later the same season, when the club went bankrupt. She debuted for the Norwegian national team on March 27, 2011 in a match against Russia. ==Achievements==