She served as the Indiana state regent of the Daughters of the American Revolution from 2009 to 2011 and as treasurer general of the national society from 2013 to 2016.

She also served as the president of the Ladies Auxiliary of the National Society Sons of the American Revolution.

[9] In 2017, she attended the installation of officers of the Galloway-Prentice Chapter of the National Society Daughters of the American Revolution in Albion, Indiana.

[12] She served as president of the National Society Sons of the American Revolution Ladies Auxiliary.

[13][14] In 2024, Barnhart attended the dedication ceremony, hosted by the Mary Penrose Wayne Chapter of the Daughters of the American Revolution, for Shrine Chapel at the Veterans National Memorial Shrine and Museum in Allen County, Indiana.