Sarah Choate Sears (May 5, 1858-September 25, 1935) was an American art collector, art patron, cultural entrepreneur, artist, and photographer.
Biography on Wikipedia: https://en.wikipedia.org/wiki/Sarah_Choate_Sears

1896 / Watercolor, gouache, and ink on paper / 13-3/4″x21-1/4″ / Private collection

c.1892-c.1905 / Gelatin silver print / 6″x8″ / Harvard Art Museums, Cambridge, MA
Sarah Choate Sears on Artnet: http://www.artnet.com/artists/sarah-choate-sears/
More links:
https://www.metmuseum.org/art/collection/search/267677
https://archive.artic.edu/stieglitz/sarah-choate-sears/
https://artsandculture.google.com/asset/mrs-joshua-montgomery-sears-sarah-choate-sears-john-singer-sargent/mgEnevNyoIuktA?hl=en