When she was 12 years old, she already played in the club's under-20 team and was described by her coach as the "potentially biggest talent in Dutch basketball".
[3] In 2014, Cornelius was supposed to play collegiate basketball for Gonzaga University, however, a knee injury forced her to abandon the plans.
In her junior year, Cornelius was the Hurricanes' co-captain, while she was forced to redshirt the season due to a leg injury.
[3] From 2019 to 2023, Cornelius played in Spain for several teams,[5] including CD Zamarat (2019-2020), Gernika KESB (2020-2021), IDK Euskotren (2021-2022) and CB Girona (2022-2023).
At the junior level, Cornelius won a bronze medal at the 2015 FIBA Europe Under-20 Championship for Women.