She must have made her debut in 1901 at the Teatro Odeon in Mendoza[2] and kept appearing in various small opera houses of Latin America till 1910.
From that point Pereira's career was almost entirely based in Italy, where she was enormously successful in small provincial theatres but almost never appeared on any important stages.
Probably the greatest achievement Pereira made in Italy was in 1917, when she sang in Gaetano Donizetti's Lucia di Lammermoor at the Teatro Carcano in Milan.
Apart from Italy, Pereira toured Spain, where in 1914 she sang Rosina in Gioacchino Rossini's Il barbiere di Siviglia, Violetta and Gilda in Verdi's Rigoletto at the Teatro Arriaga in Bilbao, and the United States, where she performed at the Tivoli Theatre in San Francisco as a member of Lambardi Pacific Coast Company.
Moreover, Pereira participated in one of the earliest complete recordings of Gioacchino Rossini's Il barbiere di Siviglia with Ernesto Badini and Edoardo Taliani as partners, made by HMV in 1919 in Milan with the orchestra and chorus of La Scala under the direction of Carlo Sabajno, where she sang the role of Rosina.