[citation needed] Her lyrical roles also included Eva in Wagner's Die Meistersinger von Nürnberg, Micaëla in Bizet's Carmen and Marguerite in Gounod's Faust.
Until 1938 she regularly sang leading roles at the Salzburg Festival, for example in 1931 and 1935 to 1938, Donna Elvira in Don Giovanni and Marzelline in Beethoven's Fidelio.
The ensemble included Lotte Lehmann as Leonore, Koloman von Pataky as Florestan, Carl Bissuti, Alfred Jerger, Anton Baumann and Hermann Gallos.
[citation needed] Her major contribution to music history was her participation in the first five seasons of the Glyndebourne Festival Opera in southern England, which was founded in 1934 by John Christie and his wife, the singer Audrey Mildmay, the conductor Fritz Busch and the director Carl Ebert.
[citation needed] Helletsgruber and her husband Karl Friedrich Alois Lehr (1896-1967) died of the consequences of a car accident in Sattledt.