juniorleague

Mary Harriman Rumsey resp. Mrs. Charles Cary Rumsey (November 17, 1881 – December 18, 1934)
She was the founder of The Junior League for the Promotion of Settlement Movements, later known as the Junior League of the City of New York of the Association of Junior Leagues International Inc.. And she was the daughter of railroad magnate E.H. Harriman and sister to W. Averell Harriman, former New York State Governor and United States Diplomat.
source: en.wikipedia.org/wiki/Mary_Harriman_Rumsey

The same woman:

Interesting. . . thanks for the connection b/n the Jr. Lge. and the Settlement movement--must learn more about this. Fascinating--she was essentially the Founder of the Junior League Movement as it exists today.

Thanks B-59 for locating her name. We will add it to our catalog record.

This photo ran in the Sunday (Portland) Oregonian on July 30, 1916 with the caption: "One of of the strongest organizations formed in support of Charles E. Hughes is that of the women of New York, who have raised a large fund and are carrying on active work to assist his campaign. A leading member of the organization is Mrs. Charles Cary Rumsey, a daughter of the late E. H. Harriman. As Mary Harriman she was well-known socially in New York. She inherited from her father a love of horses and was a frequent exhibitor at horse shows." oregonnews.uoregon.edu/lccn/sn83045782/1916-07-30/ed-1/se...

This appears to be one of several débutante announcement photographs of Margaret Resler Warren of New York City, who was introduced to society on December 9, 1913, with a reception, dinner and dance. A daughter of Mr. and Mrs. Charles Elliott Warren, Margaret was a descendant of Revolutionary War General Warren of Bunker Hill. She was a graduate of The Spence School. Her father was President of the Lincoln National Bank. [1] [2]

A different photograph of Miss Warren, by Campbell Studios, appeared in the October 19, 1913, New York Times, however the accompanying article seems to have been, perhaps, cut of débutante announcements. A variant of the above pose, by Mishkin Studios, is in the Bain Collection (shown below) of The Library of Congress, and will no doubt find its way to Flickr ;)
                                   

On January 22, 1921, Margaret Warren married Shannon Lord Meany (b.1892), the son of Mr. and Mrs. Edward P. Meany (b.1854) of Alnwick Hall, Convent, New Jersey. He was a graduate of Princeton and served as a captain during the war. Their engagement was announced in October, 1920. [3] [4] [5] [6]

Margaret and Shannon Meany separated in 1939, and she was awarded a divorce in Reno in 1940. [7] [8]
 

See notes under

Thanks for your research Pixel Wrangler. And thanks artolog, for putting the pieces together. We'll add a bit of the information about her to both records the next time we update.