Neltje Doubleday left New York and moved to
Banner, Wyoming, where in 1966 she bought a 440-acre ranch on Lower Piney Creek. She has since added to the property for cattle ranching and hay production. She operated the working ranch in part for preservation of historic and land resources; the original stone house was built soon after the
Spanish–American War. There she has gradually built her art career, learning to paint and working in a variety of materials, including sculpting. In 1967, the heiress bought the
Sheridan Inn in
Sheridan, Wyoming to save it from destruction; the property was a
National Historic Landmark that had been condemned because of deterioration. It was renewed as part of community life of the city. She owned and operated it for 18 years. Working in every aspect of its operations, she also added a gift shop and art gallery to the hotel interior. The inn has been owned since 1990 by the Sheridan Heritage Center, Inc. In her art, Neltje has concentrated on painting abstract works. She is represented by galleries and her work is held in numerous private collections and museums, including the
Smithsonian Institution;
Wyoming State Museum,
Cheyenne; and
Yellowstone Art Museum, Billings, Montana. She is the author of the 2016 memoir,
North of Crazy (9781250088147). ==Philanthropy, legacy, and honors==