Afterward she studied voice under John Dennis Mehan, theory under A. J. Goodrich and Adolph Weidig, and piano under Leopold Godowsky.

[citation needed] After marrying, she and her husband, Thomas W. Gaynor of Iowa City, moved to St. Joseph, Missouri, where Mrs. Gaynor organized the Ladies' Fortnightly Musical Club and became an active musical influence in the community.

[citation needed] In 1900, she returned to St. Joseph and established a musical school known as The Gaynor Studios, which was very successful and constituted an art center, where drawing, painting, and other arts were taught in addition to the various branches of music.

Another volume of interest to every child is Mother Goose Songs from the operetta, The House that Jack Built, which Mrs. Gaynor wrote in collaboration with Mrs. Alice C. D.

[citation needed] Mrs. Gaynor has also published some works for piano, among those best known being two books for beginners: Miniature Melodies and First Pedal Studies.

In the attractive operettas her gift of melody and of rhythm is in evidence, and also the same instinct which unites the words and music of her songs into an artistic whole.