At the 2015 South African Championships, Rooskrantz won gold on uneven bars, silver on balance beam and floor exercise, and bronze in the all-around.[4] She made her international debut at the 2015 Top Gym Tournament in Belgium, placing ninth in the all-around and sixth on the uneven bars and balance beam.[5]
Rooskrantz began the 2016 season at the Austrian Team Open where she helped the South African team finish seventh.[6] She came second in the junior all-around event at the African Championships.[7] She nearly swept the gold medals at the 2016 South African Championships but finished second on the balance beam to Naveen Daries.[8] At the 2016 Junior Commonwealth Games in Namibia, she won silver medals in the all-around, uneven bars, and team events and a bronze medal on the balance beam.[9]
Rooskrantz became age-eligible for senior competitions in 2017. She made her senior debut at the 2017 Koper Challenge Cup, finishing fifth on the uneven bars.[5] She missed the rest of the season due to a knee dislocation that required surgery.[2] She was not selected for the 2018 Commonwealth Games due to fitness concerns.[2]
Rooskrantz returned to competition at the 2018 African Championships and won the uneven bars title while helping the South African team finish second to Egypt.[10] At the Africa Safari International, she won the bronze medal on the uneven bars.[11] She then won the all-around title at the South African Championships.[12] As a result of her national championship win, she qualified for the 2018 World Artistic Gymnastics ChampionshipsinDoha, Qatar.[12] There, she finished 59th in the all-around during the qualification round.[13]
Rooskrantz began the 2019 season by winning the uneven bars title at the South African Championships.[14] She then won the uneven bars gold medal Szombathely World Challenge Cup.[15][2] This made her the first South African to win a medal at an international gymnastics competition.[3][16] At the 2019 World Championship, she finished 68th in the all-around and qualified for the 2020 Summer Olympics.[17] She was the fourth South African artistic gymnast to qualify for the Olympics since South African re-introduction in 1992 and the first since Zandre Labuschagnein2004.[17][2] Rooskrantz was one of the first person of colour artistic gymnasts to represent South Africa,[2] along with Naveen Daries, who also competed at the 2020 Olympic Games.[18]
Rooskrantz finished seventh on the uneven bars during the qualification round of the 2020 Baku World Cup.[19] However, the event finals were canceled due to the COVID-19 pandemic.[20] As the 2020 Summer Olympics were delayed due to the COVID-19 pandemic, Rooskrantz livestreamed the routine that she would have performed at the Games in August 2020.[21] She finished 61st in the qualifying stage of 2020 Olympic Games and did not qualify for any finals.[22] Her score at the Games was a personal best.[18]
Rooskrantz won a gold medal on the uneven bars at the Cairo World Cup.[23] She also won the uneven bars event at the African Championships.[24] She also won the African all-around title and qualified for the upcoming World Championships.[25] Then at the 2022 Commonwealth Games, she won the bronze medal on the uneven bars. She was the second South African female gymnast to win a medal at the Commonwealth Games.[26] She finished ninth in the all-around final, and she was part of the South African team that finished fourth.[27] She finished 47th in the all-around during the qualification round of the World Championships.[28]
Rooskrantz won the all-around and uneven bars titles at the South African Championships.[29] She then helped South Africa win the African Championships team title for the first time since 2006 and qualify for the World Championships, and she finished second in the all-around to Kaylia Nemour.[30] At the Paris World Challenge Cup, she finished fourth in the uneven bars final.[31] Then at the World Championships, she finished 46th in the all-around during the qualification round, securing qualification for her second Olympic Games.[32][33]
Rooskrantz began the season at the South African Championships and finished second in the all-around. In the event finals, she won gold on the uneven bars and balance beam and silver on the floor exercise.[34] She then finished eighth on the uneven bars at the Antalya World Challenge Cup.[35]
Rooskrantz attended Parktown High School for Girls.[36] She had planned to have a gap year to focus on competing at the Olympics, though those plans were changed due to the COVID-19 pandemic.[37] In 2022, she enrolled in the University of Johannesburg and began studying marketing management.[38] She comes from an athletic family: her father played football, and her older brother was involved in field hockey and cricket. Her father died when she was eight.[2] Her mother gave up working full-time as a nurse to support Rooskrantz's gymnastics career.[5]