She was a frequent partner of Plácido Domingo during the 1980s and also sang opposite other great artists like Montserrat Caballé, Dmitri Hvorostovsky, and Luciano Pavarotti.
She made her professional opera debut in 1981 as Elisabetta di Valois at the Liceu, in Don Carlo, with Jaume Aragall in the title role.
The same year, she sang at Liceu in the title role of Puccini's Tosca opposite Nunzio Todisco as Mario Cavaradossi and Juan Pons as Scarpia.
[2] In 1982 she sang the title role of Verdi's Aida at the Opéra Royal de Wallonie and the Sferisterio Opera Festival.
[2] While working primarily in Vienna, Troitskaya appeared as a guest artist at the Opéra National de Paris (1985, Amelia in Verdi's Un ballo in maschera), the Staatsoper Stuttgart (1985, Elisabetta in Verdi's Don Carlos), the Teatro dell'Opera di Roma (1985, the title role in Francesco Cilea's Adriana Lecouvreur), the Arena di Verona Festival (1985–1986, Aida and Amelia), the Hamburg State Opera (1986–1988, Amelia, Elisabetta, Leonora in Verdi's Il trovatore, Nedda in Pagliacci, and the title heroine of Puccini's Manon Lescaut), the Royal Opera, London (1986, Tosca), the Luxor Temple (1987, Aida), the Deutsche Oper Berlin (1988–1989, Desdemona in Verdi's Otello, Leonora and Tosca), the Teatro Nacional de São Carlos (1989, Desdemona), the Bavarian State Opera ( Adriana Lecouvreur in 1984 and later on Tosca, Elisabetta, Amelia, Tosca, Mimi and Lisa), the Washington National Opera (1989, Lisa in Tchaikovsky's The Queen of Spades, and the Los Angeles Opera (1990, Elisabetta) among others.