Mary Rogers Williams (September 30, 1857-September 17, 1907) was an American Tonalist and Impressionist artist known for portraits and landscapes.
Biography on Wikipedia: https://en.wikipedia.org/wiki/Mary_Rogers_Williams

A Girl in Red by Mary Rogers Williams
Pre-1901 / Oil on panel / 21″x14″ / Private collection

“American Impressionist Mary Rogers Williams Is Finally Getting the Recognition She Deserves”
https://www.vogue.com/article/mary-rogers-williams-biography-eve-kahn-interview

Further reading:
https://www.artandobject.com/news/rescuing-american-impressionist-mary-rogers-williams-obscurity
https://fineartconnoisseur.com/2019/12/mary-rogers-williams/
https://www.themagazineantiques.com/article/mary-rogers-williams-eve-kahn/