In July 2021, she won gold as part of the British team at the 2020 Tokyo Olympics in mixed 4 × 100 metre medley relay, swimming the freestyle anchor leg in the heat.

Anderson was painfully shy as a child; she described how she almost fled College when she was caught breaking rules and using an iPad at night.

Anderson won the Gold at 2016 European Junior Championships in Hódmezővásárhely, Hungary, finishing 0.25 seconds ahead of the field in the 100m freestyle with a time of 54.72.

Following a highly successful season Anderson won the Emerging Swimmer of the Year prize at the 2016 British Swimming Awards.

[6] At the 2018 European Championships, Anderson was part of the British team that won bronze in the mixed 4 × 200 metre freestyle relay, a new event at the game.

At the 2019 World Aquatics Championships held in Gwangju, South Korea, Anderson won a bronze as part of the team in the 4 × 100 m mixed medley relay.

[15] Both of these were personal bests (200m freestyle1:55.89s and 53.49s in the 100m freestyle) [16] Anderson was appointed Member of the Order of the British Empire (MBE) in the 2022 New Year Honours for services to swimming.