In 1894, Timlow and her sisters started a girls' boarding school named Cloverside in
Montclair, New Jersey, after their father's death left them in need of an income. They moved the Cloverside school to Washington, D.C., in 1909. She and
Florence Breed Khan addressed the graduating class in 1913. She was traveling in Germany with five students in summer 1914, when German mobilization for
World War I began, and she had to guide the party of girls to safety. They closed the school in 1918. Further writing for children followed; she also wrote books for general readership, including one about
Mount Monadnock in New Hampshire. "Never have I ever read a finer or grander description of a thunderstorm," wrote one reviewer of Timlow's
The Heart of Monadnock. Timlow was a member of the
Daughters of the American Revolution and active in the
Parent Teacher Association in Washington. She advocated smaller class sizes, older teachers, and teaching more study skills than "miscellaneous knowledge." She gave presentations on education and psychology for women's clubs and other community groups, and on radio programs. == Publications ==