Florine Stettheimer (August 19, 1871-May 11, 1944) was an American modernist painter, feminist, theatrical designer, poet, and salonnière.
Biography on Wikipedia: https://en.wikipedia.org/wiki/Florine_Stettheimer

Portrait of Alfred Stieglitz by Florine Stettheimer
1928 / Oil on canvas / 38″ 26-1/4″ / Alfred Stieglitz Collection, Co-owned by Fisk University, Nashville, Tennessee, and Crystal Bridges Museum of American Art, Bentonville, Arkansas

Florine Stettheimer on MoMA: https://mo.ma/3k2b6n3

Further reading:
https://hyperallergic.com/329408/florine-stettheimer-feminist-provocateur/
https://stories.thejewishmuseum.org/the-stetties-florine-stettheimer-and-her-sisters-a377eaa7b04d
https://www.mcny.org/exhibition/stettheimer-dollhouse-0