[9] She was a member of the Board of Lady Managers at the 1904 Louisiana Purchase Exposition in St. Louis, appointed by Governor William Wright Heard.

During World War I, she lived in Washington, D.C., and worked in the Office of Military Aeronautics, writing technical articles and press releases.

In spring 1919, she wrote a letter to The New York Times, suggesting that the United States Senate would be better able to do the work of government if they met outdoors, "In the light of God's glorious sunshine, with the breath of heaven to bring refreshment to their souls, the provincialism, the egoism, the befogged vision of the Senators would, no doubt disappear," she proposed.

[15] "Miss Egan is an ardent feminist," explained one 1921 newspaper report, "and is interested in seeing laws giving women full legal and civil rights written into the statute books of the State of Louisiana.

[17][18] Egan's personal style was considered symbolic of her "uncommon individuality and force of character", as she favored short hair and tailored suits with neckties.