Throughout her life she was an advocate for
indigenous people's rights and the
Cheyenne language. of the
Northern Cheyenne Tribe in
Montana and a teacher at
Montana State University and at
Chief Dull Knife College. As a human rights defender she was an active member of the
International Indian Treaty Council,
NOW and the
Elk Horn Scrapers. The reservation only had 2,400 people in 1976. In 1977 she gained fame as a speaker at the
Conference on Indians in the Americas of the
United Nations in
Geneva. She discussed the preservation of native American culture and languages, sovereignty and the rights of Indigenous women. During the conference she mentioned the
Family Planning Services and Population Research Act of 1970 which was enacted by the
Nixon administration. In a span of six years it resulted in circa 25% involuntary sterilization of Native American women and has been described as a modern
genocide. Sanchez argued that it was one of many injustices committed against indigenous people through American history, such as the
forced displacement and relocation of native Americans to reservations, which caused health disasters in the nineteenth century. By the late 1970s Sanchez and others' activism enabled some improvement of federal regulations to reduce unwanted sterilization procedures. ==Personal life==