Around the time of World War I, Marshall worked at the library of Southern Illinois Normal University. In 1919, she left Illinois for New Orleans, LA where she became employed at the American Library Association's War Library "scheme for soldiers not yet discharged from the armed forces." When the New Orlean's ALA office closed, she took the position of librarian at the Rudolph Matas-Orleans Parish Medical Society Library, which later consolidated into Tulane University's Medical Library. She held a dual role as Professor of Medical Bibliography. Marshall worked closely with fellow librarians Eileen Cunningham and Janet Doe on various projects. One project being the Handbook of Medical Library Practice, where Marshall authored a chapter on classification schemes. When the Army Medical Library, now the U.S. National Library of Medicine needed a chairperson to lead a committee of librarians, medical scientists, and physicians to produce a classification scheme, which would later evolve into the National Library of Medicine classification, a library indexing system covering the fields of medicine and preclinical basic sciences. When the NLM formed their first Board of Regents, Marshall was invited by Dr. Frank B. Rogers, then Director of the NLM, to serve as the only woman and the only medical librarian. Mere days after retiring from Tulane University's Medical Library in 1959, Marshall began working closely with medical school libraries in Columbia, South America as a consultant with the International Congresses on Medical Librarianship.
During her years as librarian, Marshall became an active member of the Medical Library Association. She served as membership committee chair from 1927-1929, treasurer from 1930-1937, and in 1941, was the second woman elected as President. Due to World War II, annual MLA meetings were put on hold, and Marshall became the longest running MLA President, serving until 1946. Marshall received the Marcia C. Noyes Award in 1953, the MLA's most distinguished award.
Personal life
While living in New Orleans, Marshall met and married Mr. John Henry "Jack" Hutton. In addition to her interest in medical librarianship, she was also interested in the history of medicine and wrote several books on the topic: Medicine in the Confederacy, Plantation Medicine, Versatile Genius of Daniel Drake, Nurse Heroines of the Confederacy. She was also interested in genealogy and was actively involved with the Colonial Dames, serving as their national librarian, historian, and chairwoman of research.
