As a result of her interest in promoting women's rights, in 1912 she established the Union des femmes de Wallonie which she headed until she died in 1926.
While still young, she attended the Institut d'Éducation pour Demoiselles in Liège and spent some years in Flanders.
[1] Now widowed, de Waha decided to devote her life to promoting women's emancipation and furthering education for girls.
[1] As a result of her interest in local history, at the beginning of the 20th century de Waha became attracted by the Walloon Movement, corresponding with leading figures such as Julien Delaite and Jules Destrée.
She supported proposals for the country to be divided into regions for the Walloons, the Flemings and the inhabitants of Brussels.