[1] In 1907, Viana Porto led a committee, alongside Ilda Jorge, Maria Veleda and Ana de Castro Osório, which sought to develop a nursery school in Lisbon for poor children between three and six years of age.

Later, between 1914 and 1918, during the First Portuguese Republic, she campaigned to attract new members and donations, and held various leadership positions in the LRMP, signing the petition addressed to the government of Sidónio Pais, which appealed once again for the right to vote for women.

[2][6][7] Viana Porto also supported other initiatives that had pacifist ideals, speaking at a meeting promoted in 1927 by the CNMP's Peace Section.

During that same period, she campaigned for donations for various charitable actions and for the acquisition of an airplane for Maria de Lourdes Sá Teixeira, who was Portugal's first woman pilot but could not afford to buy her own plane.

In 1928, she joined the campaign of O Rebate, the organ of the Portuguese Republican Party, which criticized the actions of the Estado Novo dictatorship, calling for an end to the recently created wave of repression and political persecution.