Based on a life history interview, this paper describes the beginning of a woman's political trajectory, as a part of Movimiento de Izquierda Revolucionaria (MIR, spanish for Revolutionary Left-wing Movement) since she was first involved in a peasant cell of Movimiento Campesino Revolucionario (MCR, spanish for Revolutionary Peasant Movement) in Los Andes and Quillota (Valparaiso), during the Unidad Popular's Agrarian Reform in Chile (1970-1973). The reconstruction of this trajectory shows how joining MIR is affected by family legacies, the University Reform and an intern's entry in the countryside. In time, the analysis of the way this life story is rebuilt helps us to understand how social memories about the recent past work when they are simultaneously subaltern in three ways; militant, female and local.