Born Léontine Van der Maësen d'Avionpuits in Esneux, Belgium, she was the daughter of the crown prosecutor in Verviers.
Her father died when she was still a young girl, and after his death she entered the Royal Conservatory of Liège where she studied singing with Théophile Vercken.
[2] She returned in the 1861-62 season and sang with great success the title role in Massé's La reine Topaze for its first Marseille performance.
After performances in Lille, she was engaged by Léon Carvalho for his Théâtre Lyrique company in Paris, where in 1863 she created the role of Leïla in Bizet's Les pêcheurs de perles.
Her performance in the premiere was a sensation with the audience, according to the critic in Le Guide musical, who went on to praise "the beauty of her voice, the perfection of her singing, her personal charm, and her talent as actress.