At age 20, Thérèsa Champagne entered the Congregation of the Missionary Oblate Sisters whose mandate it is to tend to the needs of the poor and make bilingual and religious education a priority. Sister Champagne taught for more than 34 years in public, private and residential schools through the Prairie Provinces.
Northern Manitoba needed someone to serve as a pastoral minister to the Cree, Métis and white population living in outlying communities of the Keewatin-LePas Archdiocese. She travels between the communities of Thompson, Thicket Portage and Wabowden ministering to the needs of the community.