 She made numerous guest appearance in European opera houses, starting in 1953 and was also heard in a wide range of concert repertoire.She made a notable recording of the Brahms "Ein deutsches Requiem" with conductor Bruno Walter.She became an acclaimed performer, excelling not only in Mozart, but gathering acclaim for her interpretation of Mimi in "La Boheme", and an especially thrilling Violetta in "La Traviata".