She currently skips the Swedish national team while throwing lead rocks. Sigfridsson skipped the Swedish team at the 1997 World Junior Curling Championships, winning the silver medal. Sweden lost in the final game 11–3 to Scotland, skipped by Julia Ewart.
Sigfridsson was the Swedish skip at the 2002 Ford World Women"s Curling Championship.
The score was 6–5.
Sigfridsson would later join the Stina Viktorsson rink, at first playing second, and then becoming lead in 2007. In 2010-2011, the Viktorsson rink would play in their first two Grand Slam events.
They played in the 2010 Manitoba Lotteries Women"s Curling Classic, winning 4 games before being eliminated, and at the 2011 Players" Championship, winning just two games. In 2011, Viktorsson left the rink, and Sigfridsson took over as skip, but would still throw first stones.
The team brought in Maria Prytz to throw last rocks.
They played in on Grand Slam event, the 2011 Manitoba Lotteries Women"s Curling Classic, winning four games. Despite losing the 2013 Swedish final to Anette Norberg, the Sigfridsson rink was selected to represent Sweden at the 2013 World Women"s Curling Championship. Sigfridsson and Muirhead would meet once again at the end of the season in the 2013 Players" Championship final, where she again lost to Muirhead.
lieutenant would be the first time Sigfridsson would make the playoffs at a Grand Slam event.
The team played in one other Slam that season, the 2012 Manitoba Lotteries Women"s Curling Classic, winning four games. In November 2013, Sigfridsson led Sweden to another gold medal at the 2013 European Curling Championships.
She continued this success towards the 2014 Winter Olympics, where she led Sweden to a silver medal, after losing to Canada"s Jennifer Jones in the final. A month later, she represented Sweden at the 2014 Ford World Women"s Curling Championship where she fared a much worse record, placing 5th.
The team played in three Slams in the season, winning just two games at the 2013 Manitoba Liquor & Lotteries Women"s Classic, losing in the quarterfinals of the 2013 Masters of Curling and losing in the semifinals of the 2014 Players" Championship.
The Sigfridsson rink started the 2014-2015 season by winning the 2014 Stockholm Ladies Cup. Former events.