Wolter continued to manage the Javanese sugar plant from the Netherlands and as a liberal who believed in women's suffrage and world peace, he encouraged his daughters in attaining their education.

[1] Upon completing her schooling in 1900, Broese adopted the stage name Wilma and debuted in Friedrich Schiller's play Mary Stuart with the Rotterdam Theater Company.

Settling in the Van Stolkweg neighborhood of The Hague, Broese gave up theater and focused on raising the couple's three sons: "Wolter (1905), Richard (1907) and Joachim Adolf (1908)".

Up to that point, she had been apathetic to the cause, but when the International Woman Suffrage Alliance scheduled their 4th conference to be held in Amsterdam, her family donated six hundred guilders (the equivalent of around €7,000 or $8,000 US in 2016 currency), to provide assistance for foreign attendants' travel expenses and lodging.

From 1915, she served as chair of The Hague branch's chapter committee of promulgation and hosted a booth to disseminate information about women's suffrage each Monday in the market near the intersection of the Brouwersgracht and Prinsengracht canals.

[2] Broese chaired the committee to provide accommodations for those attending the conference and met influential foreign feminists like the Hungarian sisters, Franciska and Rosika Schwimmer.

[3] The women who made up the delegations included Broese, Emily Greene Balch, Rosa Genoni, Alice Hamilton, Lola Maverick Lloyd, Cornelia Ramondt-Hirschmann, and Julia Grace Wales[4] and were divided according to whether their countries were involved in the war.

[6][7] In 1918, Broese used her theatrical talents to present a performance for the Hague chapter of the Vereeniging voor Vrouwenkiesrecht, parodying Parliamentary actions concerning women's suffrage.

[8] Shortly thereafter, she and her husband helped Aletta Jacobs move to The Hague and provided her with financial support, as she had lost her earnings due to poor investments.