Davy's performance at Lewisohn Stadium drew the attention of several notable music organizations, including the Metropolitan Opera, and she was soon working actively with a variety of music groups in New York. In October 1957 she performed the title role in the New York premiere of Donizetti's "Anna Bolena" for the American Opera Society (AOS) with Giulietta Simionato as Giovanna Seymour for performances at both Town Hall and Carnegie Hall. In December 1958 she sang with the AOS again as Elcia in Rossini's "Mosè in Egitto" with Jennie Tourel as Amenofi and Boris Christoff, in his New York debut, singing the title role. In January 1959 she returned to Carnegie Hall to sing the title role in Gluck's "Iphigénie en Tauride" with Martial Singher as Orestes, Louis Quilico as Thoas and The Little Orchestra Society (LOS). She appeared with the LOS again on October 10, 1960 for the United States premiere of Strauss' "Daphne" in a concert version at Town Hall in which she sang the title heroine.