[1][5] She was tasked with the photography of people and museum displays, such as paintings, engravings, and sculptures.

Furthermore, she created lantern slides, which were used in lectures across the United States and Europe.

[7][8] Gallaher continued to work in the museum's photographic department until her death on April 18, 1917, in Washington, D.C., at the age of 59.

[1][9][3] Prior to her death, much of her work was falsely credited to her boss, Thomas Smillie.

By 2019, Smithsonian archivists had begun correcting Gallaher's missing credits.