Our growing familiarity with the novel's symbolism tells us what this means: her ideal of helping the people is becoming an all-consuming passion. Grammatically, the "indeed" means that she is a Costaguanera because she is "never tired"; though Don Pepe is referring to her physical stamina, the narrator is obviously not (native Costaguanera women not being marked by their physical stamina). The narrator is referring to the tirelessness of her dream-ideal.