She appeared at the Metropolitan Opera in 335 performances, and took leading roles internationally, such as Wagner's Isolde at the Salzburg Festival.
Among her early roles were Tebaldo in Verdi's Don Carlos and the First Esquire when Wagner's Parsifal was first performed at the house.
[4] Her major roles there included both Elsa and Ortrud in Wagner's Lohengrin, Venus in Tannhäuser, Gutrune in Götterdämmerung, Chrysothemis in Elektra by Richard Strauss, Herodias in Salome, Marianne Leitmetzerin in Der Rosenkavalier, and Giulietta in Offenbach's The Tales of Hoffmann.
[5] She appeared as a guest at the San Francisco Opera between 1931 and 1937, as the Witch, Herodias, and as Freia, Gutrune and several other roles in Wagner's Der Ring des Nibelungen.
[9] Manski's voice appears as Freia and Gutrune in transcription recordings from the Metropolitan Opera between 1936 and 1941, conducted by Artur Bodanzky, alongside Friedrich Schorr as Wotan and Gunther, Marjorie Lawrence as Brünnhilde and Lauritz Melchior as Siegfried, which were reissued as CD.