[1] In 1850, she entered the Paris Conservatory, and in 1852, she won the first prize for the comedy and immediately debuted at the Odeon theater.

[2] From 1853 to 1859, Simonin was a board member of the French Comedy (Comédie française).

[3] In 1859, she quit theater and went to London to live with her mother and restore old books as she learned from her father.

[2] Simonin married Gustave Eugene Fould with whom she had two daughters, Consuello and Achille-Valéri.

[3] Returning to France in 1864, she devoted herself to literature after the pseudonym Gustave Haller.