[6] Harper married Maj. Livingston Mims in 1866, a prominent businessman and civil war veteran who would become the mayor of Atlanta in 1901.

[1] The Mims household was known as a gathering place for "literary, artistic and musical people", and she had a wide influence on intellectual and ethical culture of the city.

[6] In 1886, Mims attended a talk in Atlanta given by Julia S. Bartlett, a student of Mary Baker Eddy, the founder of The First Church of Christ, Scientist.

They officially organized with thirty-two charter members in January 1893, and moved again to the De Give Opera House which seated 250 people.

[6] Mims remained involved with First Church of Christ, Scientist, Atlanta, which began steps to build an edifice on Baker Street in April of 1896, and which was completed in the spring of 1899.