Soon afterwards, she undertook further Wagnerian roles, in which she was to become especially famous. Her Sieglinde ("Die Walküre"), often performed opposite Kirsten Flagstad's Brünnhilde, won its own individual triumph, and resulted in an invitation to appear as a guest artist in the Rome Opera International season, where she made her debut as Sieglinde in March 1952 under Erich Kleiber, and sang the role several times during the season. In London with equal success she sang the roles of Senta ("The Flying Dutchman") and Gutrune ("Götterdämmerung"), and on 9 December 1952 was Isolde in the great Covent Garden revival of "Tristan und Isolde."