Silje is educated at the Grieg Academy of Music in Bergen, Universität deer Künste, Berlin and holds a master degree in classical singing from the Norwegian Academy of Music, Oslo. She has during her studies and career had a strong focus on the contemporary music repertory in addition to the barock and classical vocal repertory. She works with different scenic expressions and performance settings.
She has interpreted roles as Io in The Io Passion by Harrison Birthwistle with Berliner Kammeroper in Konzerthaus Berlin and the female main part in A Gentle Spirit by John Tavener with the same company. Silje performed as a singer and performer at The National Theatre of Norway and has also worked as a dancer in the Polish Dance Theatre. She has been performing in the dance music pieces like Thousand Rooms, with choreography by Gunhild Bjørnsgaard and music by Georges Aperghis at the Coda International Dance Festival, Oslo and in festivals in France.
Silje has world premiered numerous vocal pieces and has guested festivals like Huddersfield Contemporary Music Festival, Die Donaueschinger Musiktage, Ultima Contemporary Music Festival and Bergen International Festival. Silje was granted the Norwegian Government Grants for Young Artists in 2011/2012.