Two weaker seasons followed, but Andersson was able to improve again in the winter of 2004/2005 - but was soon affected again by several illnesses. Her career highlight was the 2006 Winter Olympics , when she and Anna Dahlberg became Olympic champion in the team sprint. In the following years, however, she rarely succeeded in advancing into sprint semifinals, in 2010 and 2011 she only reached one final each. Andersson announced her retirement on April 12, 2011, not least because of chronic respiratory problems. She announced that she wanted to start studying. She took part in a total of five Nordic World Ski Championships and twelve Swedish championships and started at 102 World Cup races.