In 2011, pushed through a constitutional amendment in Oaxaca granting indigenous women full political rights.
In 2011, building on her position as President of the Congress of Oaxaca, Eufrosina Cruz successfully championed a landmark constitutional amendment to the Oaxaca state constitution that guaranteed indigenous women full political rights, including the right to participate in community decision-making assemblies and to vote and be voted for in municipal elections, even within communities governed by customary law (usos y costumbres).
This reform directly addressed the very injustice Cruz herself had suffered in 2007, when her electoral victory in Santa María Quiegolani was annulled solely because of her gender. The amendment represented one of the first major legal victories reconciling indigenous self-governance traditions with universal principles of gender equality within a Mexican state constitution.
The reform was hailed as a milestone for indigenous women's rights in Mexico, providing legal recourse and protection for women who had previously been excluded from political life in hundreds of indigenous municipalities across Oaxaca. It served as a model that would later inform national-level constitutional reforms Cruz pursued as a federal deputy, and it established Oaxaca as a pioneering state in reconciling indigenous customary law with constitutional guarantees of gender equality in political participation.