Sarah Keese Arnold 1907 (Mrs. Martin A. Flavin)
Address in 1937: Spindrift Monterey CA
assistant 1907-1908 Mount Holyoke College
teacher Fond du Lac WI
Married 1919
Mother was Clara Pratt Clark 1880
Sister was Zella Bilderback Arnold x1913
Sarah sent three cards at the same time, one of which was postmarked and identified her dorm. This narrowed down the search to two women, and she was identified as the author by her handwriting (Mount Holyoke Archives had a sample of her handwriting in her file.)
Source
All information from One Hundred Year Biographical Directory of Mount Holyoke College 1837-1937, Bulletin Series 30, no. 5; published and compiled by the Alumnae Association of Mount Holyoke College, South Hadley, Massachusetts