After completing her master's degree and after a short stay in Uruguay, Prates returned to Brazil to teach at the
Federal University of Minas Gerais. In 1971, she returned to Uruguay, where she carried out most of her academic production as well as her social and political activism. Her first works were in the areas of
demography, studies on
social structure, and research on the historical forging of
agricultural production models in Uruguay and the region. Prates was the founder of CIESU, along with a group of colleagues who chose to remain in the country after the
1973 Uruguayan coup d'état. From there, she contributed, with research and teaching, to keeping the social sciences alive and forging a generation of social scientists despite the censorship and repression of the
Juan María Bordaberry dictatorship. From her CIESU, she created GRECMU, which, a few years later, was established as an independent center. She was its director and from there, she set a new pattern: her work combined rigorous research, work with women's social organizations, and direct feminist political action, as exemplified by her creation of the popular feminist magazine,
La Cacerola, a feminist emblem of the fight against the dictatorship. It was in this final stage of the dictatorship and in the first years of democracy that her greatest contributions to the
social sciences in general and to the development of the Uruguayan and Latin American feminist academy matured. Her theses on the double invisibility of female work, her studies on informal capital-labor relations, and their articulation with patriarchy and the neoliberal model of non-traditional exports, as well as her works on the conditions of domestic workers in the country and the region. Today, her works on these subjects are reference texts on created and marked feminist and progressive research and political and social advocacy agendas. Her works are available at the
Legislative Library of Uruguay (Spanish: Biblioteca del Poder Legislativo de Uruguay). Prates also published many journal articles. ==Death and legacy==