This article, which focuses on the case of present-day Mexico, draws upon a particular individual’s life history – that of Señora Flor – to consider the mobilization of the most powerless segment of the population. The trajectory of this activist, who since 1985 has been active in an organization fighting for housing rights, allows one to grasp in a dynamic and procedural way the experience and feeling of being “rightless” in the Mexican context. The article seeks to simultaneously consider the objective (changes of status) and subjective (representations of her situation) dimensions of Señora Flor’s relationship to the access to certain rights (housing, paid employment, social security).