 With Marconi's help she auditioned in 1916 for Alfredo Martino, a prominent singing teacher attached to the Teatro Costanzi, and she made her début there in January 1918 in Puccini's "La Bohème".In July 1919 she appeared at the Royal Opera House (Covent Garden) in the title role in "Iris" by Pietro Mascagni.Sheridan returned to Italy, where her career continued to grow, with performances at the Teatro Dal Verme in Milan and at the Teatro San Carlo in Naples, primarily in Puccini roles.