Several buildings she designed (including her own home) are listed on the National Register of Historic Places (NRHP).

She attended nearby Wesleyan College in 1917 and 1918[6] but did not graduate, as her marriage to George Forest League on June 27, 1917,[4] would change her path.

[8] According to League's son Joe, the architect Curran R. Ellis (1872–1934), who designed the county courthouse and baseball stadium in Macon, is a distant relative as well.

[11] In a later newspaper interview League observed, "it's almost impossible to get a license in this state, unless you have a diploma from Georgia Tech.

[6] BAID was modeled after the École des Beaux-Arts in France and League wanted to take her education further in that vein.

Leaving her young children with her parents, she continued her education with a year at Ecole des Beaux-Arts at Fontainebleau, which she attended with her cousin Nell Choate Shute in 1927 and 1928.

Oliphant died suddenly in April 1933 at the age of 40,[12] leaving League and Warren with a problem – neither was licensed, so they could finish existing commissions but could not legally accept new work.

[13] The state registration for architects in Georgia required either an architecture degree (which League did not have) or ten years of experience in a licensed office (which she did) and passing a week-long examination.

[15] Most women architects at this time concentrated on residence design, but League took on a wide variety of projects.

[16] The list of her commissions from 1934 through 1969 includes many residences but also offices, retail stores, churches, schools, public housing, auditoriums, gymnasiums, hospitals, a service station and a reservoir.

Her firm expanded in the Post-World War II era, and League hired many young architects and gave them their start.

[28] One was Georgia Tech student Bernard A. Webb, who went on to design noted residences in the Macon area himself.

[31] She was selected to be a member of the American Institute of Architects (AIA) in June 1944,[32] only the second woman from Georgia.

[67] She received the Ivan Allen Senior Trophy for her work on the Macon opera house renovation in 1975.