Johnson exhibited her work, "The Portrait Monument" and a bust of Caroline B. Winslow at The Woman's Building at the 1893 World's Columbian Exposition in Chicago, Illinois. The high point of her professional career was to complete a monument in Washington D.C. in honor of the women's suffrage movement. Alva Belmont helped to secure funding for the piece, "Portrait Monument to Lucretia Mott, Elizabeth Cady Stanton, and Susan B. Anthony", which was unveiled in 1921. This piece was originally kept on display in the crypt of the US Capitol, but was moved to its current location and more prominently displayed in the rotunda in 1997.