From 1907 to 1912, she taught French literature at a middle school.
In 1913, with her friends Marie Closset and Marie Gaspar, she established the Institut de culture française.In 1895, she began publishing her first stories in the literary journal L’Art Jeune, which was founded by the poet Henri Vandeputte.
There she met her future husband Maurice Belval, also a writer.Rousseau died in Uccle at the age of 74.