Sellars served as chief of
Xat'sull First Nation at
Soda Creek,
British Columbia, in 1987–1993 and again from 2009–2015. She was also an advisor to the
British Columbia Treaty Commission. in the book "
Victims of Benevolence: The Dark Legacy of the Williams Lake Residential School," by Elizabeth Furniss. In 2012, Sellars published "
They Called Me Number One:Secrets and Survival at an Indian Residential School" recounting her childhood experience at
St Joseph's and how that experience had and continues to have lasting impacts on her and her family's lives. Her
memoir exposed the injustices and cruelties of the
Canadian Indian residential school system. The book won the 2014
George Ryga Award for Social Awareness, and was shortlisted for the 2014
Hubert Evans Non-Fiction Prize. In the same year, 2014, the dam breach at the
Mount Polley mine happened. Sellars was the Xat'sull acting chief at the time and she has worked since then to bring attention to the conflicts between mining and First Nations communities in British Columbia as well as the rest of Canada. In 2016, she published "
Price Paid: The Fight for First Nations Survival" that examines the history of Indigenous rights in Canada from an Indigenous perspective. and a Senior Leader of the Indigenous Leadership Initiative. warning other communities of potential risks from mining activities. == Honours and awards ==