Jansen debuted internationally in 2022, when she was selected for the African Championships in Cairo. She won silver in teams and bronze with clubs.[2]
The following year, she competed at the Julieta Shishmanova tournament in Bulgaria, where she placed 5th in the ribbon final and was also awarded a special prize for artistry.[3] In July, she was selected for the Junior World Championships in Cluj-Napoca along with Tricha Richards and the junior group. There, she was 31st in teams, 44th with ball and 38th with clubs.[4] In September, she won silver in the all-around and won gold in all the event finals at the Gym Games.[5][6]
In 2024, she won silver in teams (along with her teammates Jeanne Marie Kitshoff, Kristen Hannie and Tricha Richards) at the African Championships in Kigali. Individually, she won four bronze medals, one in the all-around and three in the event finals with hoop, clubs and ribbon.[7][8] At the Gym Games, she won gold in the all-around.[9]
Jansen became a senior in 2025. In May, she was selected for the African Championships in Cairo along with Stephanie Dimitrova.[10]
South Africa 
