Pietilä-Holmner took five medals in the World Championships, two as an individual and three in the team events. She was the silver medalist in giant slalom in 2007 at Åre, Sweden. Four years later in 2011, she won 2 bronze medals at Garmish-Partenkirchen in the slalom and the team event. At Schladming in 2013, she won a silver in the team event. She took her final Worlds medal at the 2017 Championships, where she was part of the Swedish squad which finished third in the team event.