As the Great Sioux War of 1876 began over the continued violation of Sioux ownership of the Black Hills, Eagle Woman did not take part in negotiations following the failed attempt of 1875. She did not support the "Sell or Starve" policies and the Act of 1877, which resolved to cut off all government rations to the Sioux until they agreed to peacefully cede the Black Hills. This came to pass in the signing of treaties in October, which led to the creation of the Standing Rock Indian Reservation. After the loss, she again took up her role of helping the tribes adapt to this new reservation life.