[8] Atkin has dual British and US nationality, but joined the GB Park & Pipe programme, and started competing for Great Britain when she was 15 during the 2013–2014 season.

[6] She competed at the FIS Freestyle Ski and Snowboarding World Championships 2017 in Sierra Nevada, Spain, where she won bronze in slopestyle.

[14][15] Atkin took silver in the slopestyle event at the 2021 Winter X Games despite crashing on her fourth run and being taken to Aspen Valley Hospital.

[16][17] At the 2018 Winter Olympic Games at Pyeongchang, South Korea, she scored 84.60 points in her final run to win the bronze medal in slopestyle.

However, Atkin had broken her pelvis seven weeks prior to the start of the games, and despite intending to compete and flying to Beijing, on 30 January 2022 she announced that she would withdraw from the big air event.