She won a silver medal at the 2009 Junior World Alpine Skiing Championships in Garmisch-Partenkirchen, in the downhill event.

The same happened in two races in Åre in mid-December 2009, before she collected her first World Cup points with a 28th place in the super combined event in Val-d'Isère.

However she also secured her best senior World Championship result that year, finishing tenth in the combined competition.

Her best results in the FIS Alpine Ski World Cup were a pair of fifth places which were obtained in downhills in Lenzerheide in March 2011 and Val-d'Isère in December 2013.

[2] In January 2016 Smiseth Sejersted crashed in a World Cup downhill race in Zauchensee, suffering ligament injuries which ruled her out for the rest of the season.