She also appeared in Verdi operas, in the title role of Aida, as Amelia in Un ballo in maschera, and as Leonore in La forza del destino.
She performed the title roles of Ariadne auf Naxos and Arabella by Richard Strauss, and of Puccini's Tosca and Turandot.
[1] She appeared at the Bayreuth Festival, in 1977 as Ortlinde in Wagner's Die Walküre, and in 1978 in the same work in the leading part of Sieglinde.
Both performances were part of the production Jahrhundertring, staged by Patrice Chéreau and conducted by Pierre Boulez.
[1] Schirmer was awarded the title Kammersängerin in Mannheim on 7 July 1981, together with Michael Davidson and Franz Mazura.