She was a member of OH Leuven in the renewed Belgian Women's Super League for the 2020-2022 seasons, ending both seasons as vice-champions behind RSC Anderlecht. Onzia played her last game for OHL on May 7, 2022 during a 5-2 victory over Standard Liège where she scored the 3rd OHL goal.[3]
International career
Onzia was a member of the Belgium U-17 and U-19 squads. She made her first appearance for the Red Flames on September 6, 2006 against Scotland. She was also a member of the Euro 2017 squad.[4]
After missing out on the EURO 2022 finals, Onzia ended her active playing career and joined the Belgian squad as a staff member for the rest of the tournament.
She subsequently joined the Belgium U-23 staff as assistant coach.[7]