In 1990, Studer returned to the Metropolitan Opera to sing the role of Donna Anna in Mozart's "Don Giovanni". That same year, Studer sang the role of Elsa in Richard Wagner's "Lohengrin" at the Vienna State Opera. In 1991, Studer performed two more roles at the Met, Elettra in Mozart's "Idomeneo" and Violetta in Verdi's "La traviata". She sang the role of Gilda in act 3 of Verdi's "Rigoletto" at the Metropolitan Opera's 25th Anniversary Gala, opposite Luciano Pavarotti and Leo Nucci. In 1990, she also sang Odabella in Verdi's "Attila" at La Scala and Countess Almaviva in Mozart's "Le nozze di Figaro" at the Vienna State Opera.