 At the 2014 Winter Olympics in Sochi Kalla ran the final leg in the 4 × 5 km women's relay race and started third with a 25.7 seconds lag behind the first place but reduced the gap, overtaking her competitors in the final straight, earning Sweden the first gold medal in the women's relay event since 1968.At the 2018 Winter Olympics in Pyeongchang Kalla won Olympic gold medal in the skiathlon event.On 6 January 2008, Kalla won the second edition of Tour de Ski in her debut in the event.