 She also appeared in Beethoven's "Fidelio", Bellini's "Norma", Mozart's "Don Giovanni" and Weber's "Oberon" during the course of her career.From 1922 to 1927, von Mildenburg was a guest artist at the Salzburg Festival, appearing in Hugo von Hofmannsthal's stage work "Das Salzburger große Welttheater", among other productions.After retiring from opera, she gave singing lessons in Munich.