She made her debut at the Salzburg Festival in 1962 as Marcellina in Mozart's Le nozze di Figaro,[4] and performed the role of the Third Lady in his Die Zauberflöte a year later, staged by Otto Schenk and directed by István Kertész.[5] In 1965, she appeared there as Dorabella in his Così fan tutte, staged by Günther Rennert and directed by Karl Böhm, alongside Evelyn Lear as Fiordiligi.[6] She appeared at the Glyndebourne Festival from 1965 to 1968, as Jane Seymour in Donizetti's Anna Bolena, as Lady Billows in Britten's Albert Herring, as the Sorcerer in Purcell's Dido and Aeneas, and as Storgé in Handel's Jephtha.[7][2] She performed at the Royal Opera House the roles of the Countess de Coigny in Charpentier's Andrea Chénier, Andromache in Michael Tippett's King Priam, Queen Gertrude in Humphrey Searle's Hamlet, the Kostelnička in Janáček's Jenůfa, Marcellina, Baba the Turk in Stravinsky's The Rake's Progress, and Mrs. Sedley in Britten's Peter Grimes.[3] Her roles also include Lady Macbeth in Verdi's Macbeth, Herodias in Salome and Adelaide in Arabella, both by Richard Strauss, Claire Zachanassian in Gottfried von Einem's Der Besuch der alten Dame, and the Old Lady in Leonard Bernstein's Candide.