She was one of the leading proponents of women's suffrage in the country, drafting the Anteproyecto de Ley de Reforma Parcial del Código Civil (Bill partially amending the Civil Code).
In 1992, the amendment of the Paraguayan Civil Code finally recognized equality between men and women.
[1] The wording of Article 1 of Law 704/61 was simple: “Reconócese a la mujer los mismos derechos y obligaciones políticos que al hombre.” (It is hereby recognized that women have the same political rights and obligations as men.
[3] CLADEM (Comité de América Latina y El Caribe para la Defensa de los Derechos de la Mujer; Committee for Latin America and the Caribbean for the Defense of Women's Rights) Paraguay nominated Sandoval as a candidate for the "1000 Women for the Nobel Peace Prize 2005" as a part of the PeaceWomen Across the Globe initiative.
Sandoval suffered a stroke and was confined to a wheelchair before her death in Asunción in 2005.