[2] She appeared as Sempronia in the premiere of the critical edition of Jacques Offenbach's Apothicaire et perruquier at the Kurtheater Bad Ems on 1 June 2007, with the WDR Rundfunkorchester Köln, directed by Helmuth Froschauer.
[3] In July 2010, she created the role of Ariadne in the world premiere of Wolfgang Rihm's Dionysos at the Salzburg Festival,[4] repeated at the Berlin State Opera in 2012.
[5] In January 2011, she gave a lauded portrayal of Despina in Mozart's Così fan tutte at the Festspielhaus Baden-Baden.
[6] In October 2011, she made her debut at the Metropolitan Opera as Zerlina in the company's new staging of Mozart's Don Giovanni.
[7] On 14 February 2013, Erdmann attempted to represent Germany in the Eurovision Song Contest 2013 with Die Priester [de] singing a revised version of Ave Maris Stella.