In 1916, she made her debut at La Scala, Milan, as Rosina, and returned there in 1921. The following year, de Hidalgo appeared in Buenos Aires at the Teatro Colón, in "Rigoletto", "La traviata", and "The Barber of Seville". In 1924, she appeared in London with the British National Opera Company, at Covent Garden, in "Rigoletto". On 17 February 1924, she also appeared at the Royal Albert Hall with the London Symphony Orchestra and Sir Thomas Beecham conducting. That same year, she sang "Lakmé" and "Il barbiere" in Chicago. In 1926-27, she appeared opposite Chaliapin again, for a tour of the United States and Canada, with his Universal Artists Incorporation Company, in "Il barbiere".