Johnson is a Chickasaw citizen and owns a tribal consulting company providing services to the Chickasaw Nation in the area of administrative support and policy development. Johnson is the former Secretary of Treasury for the Chickasaw Nation. She is a CPA with a bachelor of science in Business Administration (Accounting) from Oklahoma State University. She currently serves as an advisory executive director of the Oklahoma State University School of Accounting. She serves as a trustee of the Chickasaw Foundation and is a current appointed commissioner of the Oklahoma Ethics Commission. She previously served on the board of directors of Citizens Bank of Ada, Okla., served as an elected tribal legislator in the Chickasaw Legislature and served on the Advisory Committee of the Internal Revenue Service representing Indian tribal government.