In 2002, she was the laureate of the Musica Juventutis competition of the Konzerthaus, Vienna, and received a sponsorship award from the Mozarteum University Salzburg in 2003.

She then continued to sing Cleopatra in Handel's Giulio Cesare in Egitto in Vienna, Donna Elvira in Mozart's Don Giovanni at the chamber opera at Schloss Rheinsberg, Pamina in his Die Zauberflöte, Mařenka in Smetana's The Bartered Bride and Antonia in Offenbach's The Tales of Hoffmann at the opera Klosterneuburg as well as Micaëla in Bizet's Carmen at the municipal theatre of Klagenfurt.

She was then engaged at the Zürich Opera by Nikolaus Harnoncourt, where she has performed in roles such as Pamina, First Lady, Drusilla, Celia, Anna Geppone, First Flower Girl, The Duchess of Parma, Solveig, Marzelline, Micaëla, Vitellia, Rosalinde, Elisabeth und Gutrune.

Conducted by Ingo Metzmacher, Trattnigg also sung Martha in a rendition of Schubert's Lazarus with the German Symphony Orchestra Berlin.

Up to now, Trattnigg has worked with conductors such as Nikolaus Harnoncourt, Zubin Mehta, Franz Welser-Möst, Fabio Luisi, Bernard Haitink, Nello Santi, Christian Thielemann, Marc Minkowski, Thomas Rösner, Andrés Orozco-Estrada, Ivor Bolton, Christoph von Dohnányi, Philippe Jordan, Ingo Metzmacher, Daniele Gatti, Ulf Schirmer, Plácido Domingo and Krzysztof Penderecki.