She attended Toneheim Folkehøgskole in 2000 together with Erlend Tvinnereim, Marit Tøndel Bodsberg, Audun Iversen, Lina Johnson, Kjetil Støa, Nina Sæterhaug among others, where her formal musical studies continued, and now she is a graduate of Tromsø musikkonservatorium, University of Tromsø 2003, Stavanger Musikkonservatorium, University of Stavanger 2005, and The Royal Danish Opera Academy.
[2][3][4] While studying, Vetlesen sang Adina and Norina in Donizetti's L’Elisir d’Amore and Don Pasquale, Gretel in Humperdinck's Hänsel und Gretel, Gilda in Verdi's Rigoletto, Juliette in Gounod's Roméo et Juliette, Frasquita in Bizet's Carmen, Sophie in Der Rosenkavalier by Strauss, Musetta in Puccini's La Bohème, Susanna and Ilia in Mozart's Le Nozze di Figaro and Idomeneo.
In 2008, she made her operatic debut as Barbarina in Mozart's Le Nozze di Figaro at the Royal Danish Opera in Copenhagen.
She later sang Tebaldo in Verdi's Don Carlos, also at the Royal Danish Opera, Gianetta in Donizetti's L’Elisir d’Amore at Aarhus Summer Opera, Denmark, and she was invited to play the role of Rosalind in Shakespeare's Romeo and Juliet at the Norwegian Nationaltheatret in Norway 2010.
Vetlesen was a soloist in Schnittke's Requiem, Pergolesi's Stabat Mater, Bach's Christmas Oratorio, Händel's Israel in Egypt, Mozart's Große Messe, Gounod's St. Cecilia Mass and Schubert'’s Mass in G. She has held chamber concerts as a lied-singer in Norway, Denmark and France.