She holds the joint record as Sweden's most decorated Olympic competitor and is the all-time leader among Swedish female athletes.

This made Kalla the first Swedish female cross-country skier to win individual golds in both the Olympics and World Championships.

[3] Kalla won the gold medal in the women's 10 km individual for Sweden at the 2010 Winter Olympics in Vancouver, British Columbia, Canada, with a time of 24:58.4.

In the 4 × 5 km women's relay race, held on 15 February, she ran in the final leg and started third with a 25.7 sec lag behind the first place and a 19.9 lag behind the second place, but totally reduced the gap, and overtook her competitors in the final straight, giving Sweden the gold medal.

[12] On 17–18 April 2015, Kalla participated and placed second in Keb Classic, a ski mountaineering event in Kebnekaise, Sweden, with Emelie Forsberg and Josefina Wikberg.

[14] In 2023, Kalla competed on the Swedish reality TV series Let's Dance, pairing with professional dancer Tobias Karlsson.