Kristoffersen achieved her first top 10 placement in the Scandinavian Cup in February 2012 in Madone with 10th place in the 15 km freestyle mass start race. In December 2012 she finished fourth in Sjusjøen in the 10 km freestyle and achieved her first podium finish in Östersund over the same distance in January 2013 . At the U23 World Championships in Liberec in 2013 , Kristoffersen was seventh in the skiathlon and finished eleventh in the 10 km freestyle and 26th in the sprint. In February 2013 she achieved her best placement in the Scandinavian Cup with second place in the 15 km freestyle mass start race in Inari . In March 2013 Kristoffersen made her debut in the cross-country skiing world cup at Holmenkollen in Oslo over 30 km freestyle in mass start , but did not finish the race. At their second World Cup competition in December 2013 Lillehammer she came over 10 km classic 48th to the finish and finished with the fourth Norwegian season in 14th place in 2014 launched Kristoffersen again at the U23 World Championships , reaching # 24 in the Sprint, twelfth 10 km classic and tenth place in the skiathlon. She achieved her best placement in the overall ranking of the Scandinavian Cup in the 2012/13 season with sixth place. In 2016 and 2017 she won the Saami ski race over 90 km freestyle.
Norway