Born in 1896, in Plymouth, Wisconsin, Andrus was primarily a lithographer, though her works include watercolors, pencil drawings, oil paintings and book illustrations. She attended Minnesota School of Architecture and Minneapolis Institute of Arts and in 1934, won a scholarship to the Art Student's League in NY where she would study with George Grosz, Eugene Fisch, and Boardman Robinson.
Andrus discovered lithography in the 1930's, always printing her works in small editions with the help of master printer George C. Miller and his son. Many of her images were inspired by her travels to Nova Scotia and the Gaspe Peninsula during the 1930's.
Andrus held a position on the staff of the Metropolitan Museum of Art, NY from 1931-1957 and was herein rewarded two scholarships to study in France. She would return to the United States to live and work in Rockport, Massachusetts in 1958. Andrus was the author of several articles on lithography and on three books printed from 1939-1967, "Sea Bird Island", "Sea Dust" and "Black River, a Wisconsin Story".
Andrus is a member of the National Association of Women Artists, the American Artists Group, the Creative Art Associations, Boston Printmakers, Boston Society of Independent Artists, Cape Ann Society of Modern Art and the Rockport Art Association. She was elected a Fellow of the Royal Society of Art in London in 1950. Andrus’s prizes include Minneapolis Institute of Arts (1928), Boston Print Makers (1954) and the Rockport Art Association (1957, 1961, 1962). Her lithograph, “Memory Stairs”, which was exhibited at the New York World’s Fair, won the 1941 medal from the National Association of Women Painters and Sculptures.