Dietrich continued her advocacy work in New Mexico for the Puebloan and Navajo people by lobbying against development of dams and exploration in villages. She was president of the New Mexico Association of Indians Affairs from 1932 until 1953 and member of the
Indian Arts Fund. She raised funds for the New Mexico Association of Indians Affairs and developed programs to help Native Americans in the state. The association sponsored the Santa Fe Indian Club during
World War II. Dietrich produced a newsletter to inform troops about their fellow New Mexican soldiers and what was happening on the home front, sent packages to the soldiers for Christmas, and generally sought to improve morale and support the Native American troops from New Mexico. She helped form the Indian Arts Fund and the Spanish Colonial Arts Society. She served as a trustee for the Laboratory of Anthropology (now the
Museum of Indian Arts and Culture) and the School of American Research (now the
School for Advanced Research). She amassed 234 Native American paintings by 104 artists and representing 15 tribal divisions. Her collection was shown at the
National Gallery of Art in Washington, D.C., the
Museum of Modern Art in
New York City, and other museums and galleries. She was a patron for Native American art students of
Dorothy Dunn (at the
Santa Fe Indian School). Of a proposed dam site on Native American lands, she wrote: ==Publications==