She performed a wide repertoire from coloratura roles to Wagner's Elsa in Lohengrin and Giordano's Maddalena in Andrea Chénier, which she recorded on DVD alongside Franco Corelli.

She achieved prizes at competitions in Milan and Rome in 1963, and performed at Italian opera houses in Genoa, San Remo, Pisa, and Venice, and at the Opéra National de Lyon.

[3] She appeared there as Leonore in Beethoven's Fidelio,[2] Agathe in Weber's Der Freischütz, Elsa in Wagner's Lohengrin, Tatiana in Tchaikovsky's Eugene Onegin, and Maddalena in Giordano's Andrea Chénier.

She portrayed Vitellia in Mozart's La clemenza di Tito at the 1984 Mozartwoche in Salzburg, the Marschallin in Der Rosenkavalier by Richard Strauss in Dublin in 1985, and Elisabeth in Tannhäuser at the 1986 festival of Las Palmas.

[2][7] Casapietra recorded the role of Fiordiligi in the German version of Così fan tutte in 1971, with Suitner conducting the Staatskapelle Berlin, alongside Annelies Burmeister as Dorabella, Sylvia Geszty as Despina, Peter Schreier as Ferrando, Günther Leib as Guglielmo, and Theo Adam as Don Alfonso.

[10] Reviewer Alan Blyth from Gramophone wrote that she successfully played her role of a spoiled girl who developed into a desperate lover, "singing with a nice combination of tenderness and intense feeling".