In Italy, Tullio Serafin invited her to sing Sophie ("Der Rosenkavalier") in Rome and Florence. From then on, she gained great successes in Paris, Milan, London, Venice, Glyndebourne, and other major cities. She made her debut at Salzburg Festival in 1946 by singing Zerlina in Mozart's "Don Giovanni" in 1946. In 1947, she started a long membership with the Vienna Staatsoper, where she was still of the greatest stars up to 1973. In December 1951, she debuted at the Metropolitan Opera as Gilda in "Rigoletto". In 1953, she sang Ann Trulove in the first U.S. performance of Stravinsky's "The Rake's Progress" at the Metropolitan Opera.