Billy is a long-time supporter of history and historical preservation in Arizona. She is a charter member and five-time president of the Pinal County Historical Society, was appointed to the Arizona Historical Advisory Commission, worked on Governor Bruce Babbitt's Task force on Parkways, Scenic and Historic Roads, and is the 1988 recipient of the Governorís Award for Historic Preservation.

Billy helped organize the City of Florence Founders Day, now an annual event. She is also active in nominating buildings to the National Register of Historic Sites.

For many years, Billy, with her late husband, Lynn, traveled the state promoting historic preservation and offering encouragement and advice to local historical societies. She serves with and for numerous committees, institutions, and societies to promote history in Arizona.