 She began making treks into the San Diego backcountry, to meet the surviving communities of Diegueño and Luiseño Indians.Soon she was writing about their traditional and contemporary lifeways, promoting traditional crafts (particularly basketry), and helping with financial and political assistance.DuBois' longest ethnographic work was a detailed monograph on "The Religion of the Luiseño Indians of Southern California" (1908), edited by Alfred L. Kroeber.