Janse van Rensburg made her debut for the Springbok Women in 2021. In a test match against Namibia, she scored two tries and added 14 conversions for a personal contribution of 38 points – a new Test record for the Springbok Women.[4]
In 2022 she was selected for the 2021 World Cup squad. In South Africa's second game against Fiji, they were awarded a penalty in the 79th minute, Janse van Rensburg kicked and South Africa went ahead 17–14. Fiji, would retain the restart and score a try to win the game.[5]
In 2023, Janse van Rensburg was named as a part of the first professional women's team in South Africa, the Bulls Daisies.[6] She was the vice-captain in their 2023 Women's Premier Division win.[7][8]
In April 2023, it was announced that Janse van Rensburg would join the sevens team ahead of the 2023 World Rugby Sevens Challenger Series. South Africa won the series and earned promotion to the SVNS, Janse van Rensburg scoring the game-winning try in the final against Belgium.[9][10]
Janse van Rensburg played in WXV 2 for the XV team, where she was the top try scorer and top point scorer, as South Africa finished third.[11] She joined the sevens team for the 2023 Dubai Sevens, where she sustained an injury.[12]
In 2024, Janse van Rensburg was named as the 2023 SA Rugby Women's Player of the Year.[13] Following her recovery, Janse van Rensburg joined the team for the 2024 Spain Sevens.[14] She was a member of the South African side that competed at the 2024 Summer Olympics in Paris.[15][16]
On 9 August 2025, she was named in South Africa's squad to the Women's Rugby World Cup.[17][18]
