For the first time she participated at the World Championships in 2007 in Antholz-Anterselva, Italy. Actually, Valja missed almost the half of the 2006-07 Biathlon World Cup. Next season was more successful. She won the silver medal in 4×6 km relay event at the Biathlon World Championships 2008. First World Cup relay victory came on 7 January 2009, in Oberhof, Germany.