Killi first appeared internationally in March 2014 at the European Freeski Open in Laax . There she won in slopestyle . The following month she won the silver medal in slopestyle at the Junior World Championships in Chiesa in Valmalenco . She made her debut in the World Cup in the 2014/15 season . She finished sixth in Park City and third in Silvaplana . At the Freestyle Skiing World Championships 2015 on Kreischberg , she was eighth in slopestyle. Also in the season she won in slopestyle at the Freeski Cup in Oppdal and in Drammen and came second in the Slopestyle at the European Freeski Open in Laax. She finished the season in third place in the Slopestyle World Cup. In April 2015 she won second place in the disciplines of slopestyle and big air at the Norwegian championship in Hafjell . At the Winter X Games 2016 in Aspen , she won the bronze medal in slopestyle. In February 2016 she won the silver medal in Big Air at the X-Games Oslo 2016 in Oslo .
After finishing second at the World Cup in Font Romeu in January 2017, Killi won the bronze medal in slopestyle at the Winter X Games 2017 in Aspen . She also finished fifth in the Big Air competition. The following month, she took third place in the Slopestyle World Cup in Mammoth and won her first World Cup victory in Québec . At the X-Games Norway 2017 in Hafjell, she won the gold medal in Slopestyle and took sixth place in the Big Air competition. She finished the season in 11th place in the overall World Cup and in second place in the Slopestyle World Cup. In the 2017/18 season she won the Winter Dew Tour in Breckenridge and the World Cup in Snowmass in slopestyle. She also took second place in Big Air in Milan and in Slopestyle in Silvaplana and thus reached 21st place in the overall World Cup, seventh place in the Big Air World Cup and second place in the Slopestyle World Cup. At the Winter X Games 2018 she won the silver medal in Big Air and also came seventh in Slopestyle. In February 2018, she finished fifth in slopestyle at the Winter Olympics in Pyeongchang . The following year she became Norwegian champion in Slopestyle and Big Air and finished ninth in Big Air at the World Championships in Park City . She took silver in Big Air at the Winter X Games 2019 and took silver at the X Games Norway Fifth place in Big Air in 2019 .
In the 2019/20 season, Killi achieved third place in the Slopestyle and Big Air World Cup with second place on the Alpe di Siusi and first place in Beijing . At the X-Games Norway 2020 she won the bronze medal in Big Air.
Norway
