Her thesis, on royalist resistance on the Asunción-Montevideo axis during the wars of independence, first published in 2013 with the title Los Muy Fieles.
During 1999 and 2000 she taught the course "National Historiography", part of the postgraduate program in historical research at CLAEH [es].
This led her to deepen her interest in the Supreme Dictator José Gaspar Rodríguez de Francia, who gave him political asylum.
The first of the two volumes of Los muy fieles is dedicated to the Spanish people of Asunción, and the second to those of Montevideo, given her great knowledge of both countries in the 19th century.
[3] Following the 2009 primary elections [es], Ribeiro decided to expressly support the National Party pre-candidate Jorge Larrañaga.