[1] She made her debut at the Salzburg Festival in 1980 in Ernst Krenek's Karl V, and continued to perform there regularly over the next decade.
She appeared at Salzburg in performances of Othmar Schoeck's Penthesilea (1982), Gottfried von Einem's Dantons Tod (1983), a concert of works by Wolfgang Amadeus Mozart in 1987, and Richard Strauss's Elektra (1989).
She returned to the VSO several times during the 1990s, including appearances as Annio in La clemenza di Tito (1991), Octavian in Der Rosenkavalier (1991), and Nicklausse in The Tales of Hoffmann (1995).
[1] In 2000 she performed the role of Juno in the first modern revival of Giovanni Legrenzi's La divisione del mondo at the Schwetzingen Festival.
[2] Other roles Sima has performed on stage include Barbarina in The Marriage of Figaro, Berta in The Barber of Seville, Esmeralda in The Bartered Bride, The Fortuneteller in Arabella, Flora in La traviata, Giannetta in The Elixir of Love, Papagena in The Magic Flute, the Shepherd Boy in Tannhäuser, Siébel in Faust, and Xenia in Boris Godunov among others.