Moore went on a trip to New York City in 1909 with another Bryn Mawr student, where she heard a lecture by the Colorado suffragist Judge Ben Lindsey, went to a suffrage mass meeting, and saw J. M. Barrie's classic suffragist-themed play "What Every Woman Knows". There is speculation that Moore also participated in the women's suffrage parade of 1913 in Washington, D.C., one day before Woodrow Wilson's presidential inauguration. Although in her personal letters she told her brother, Warner, that she did not participate in the parade after he cautioned her about the possible dangers she would face from the opponents of the parade, "er scrapbook includes programs and newspaper clippings about the march", and she later told the poet Elizabeth Bishop that she "paraded with the suffragettes, led by Inez Milholland on her white horse".