She was the fifth of six children of Jacques Félix and Esther Thérèse Hayer, all of whom became actors, and a 9-year younger sister and pupil of the great Rachel. She had hardly been given any trial when, by chance, she was called on to create the leading woman's part in Lamartine's Toussaint Louverture at the Théâtre de la Porte Saint-Martin on 6 April 1848. The play did not make a hit, but the young actress was favorably noticed, and several important parts were immediately entrusted to her. She soon came to be recognized as one of the best comedians in Paris. Rachel took Lia to United States with her to play second parts, and on returning to Paris she played at several of the principal theatres, although her health compelled her to retire for several years. When she reappeared at the Théâtre de la Gaîté in the title role of Jules Barbier's Jeanne d'Arc she had an enormous success. Her last theatrical appearance was in Victorien Sardou's La Haine in 1874.