[2] She has been a member of the Vienna State Opera from the 2004/05 season for six years,[2] where she appeared as Mrs. Quickly in Verdi's Falstaff, Ulrica in Un ballo in maschera, Herodias in Salome by Richard Strauss, Annina in Der Rosenkavalier, Margret in Berg's Wozzeck and Brigitta in Korngold's Die tote Stadt.

She performed the role of the Marquise de Birkenfeld in Donizetti's La fille du régiment in 2007, alongside Natalie Dessay, Juan Diego Flórez and Montserrat Caballé.

[3] Baechle appeared as a guest as Ortrud at the Teatro Colón in Buenos Aires, as Fricka at the San Francisco Opera,[2] as Mrs. Quickly and Brangäne at the Théâtre du Capitole, as Ježibaba at the Opéra National de Lyon, and as Gaea in Daphne ) and as Brangäne at the Liceu in Barcelona.

Baechle sings a broad repertoire of lieder, with pianists Markus Hadulla [de] and Charles Spencer.

She appeared in Mahler's Lieder eines fahrenden Gesellen and Schönberg's Gurre-Lieder in notable concert halls.