Born and raised in Munich, Landshamer studied singing at the Hochschule für Musik und Theater München with Angelica Vogel from 1996.
In 2003, Landshamer was awarded a scholarship by the Deutscher Musikrat and two years later took part in the world premiere of Hans Zender's Chief Joseph, a musical theatre in three acts, at the Staatsoper Unter den Linden.
At the beginning of 2007, she took on the main role in the world premiere of Trans-Warhol - the voice of Andy Warhol - by the French composer Philippe Schoeller [fr] in Geneva.
[3] The soprano sang under the direction of renowned conductors such as Christian Thielemann, Marc Albrecht, Stefan Asbury, Riccardo Chailly, Enoch zu Guttenberg, Matthew Halls, Peter Schreier, Ulf Schirmer and Helmuth Rilling.
[4] In the 2008/2009 season, she sang Zerlina and Amor in Orpheus and Eurydice at the Staatsoper Stuttgart, later Marzelline in Strasbourg and Susanna at the Komische Oper Berlin.