Sarah Paxton Ball Dodson (February 22, 1847-January 8, 1906) was one of the leading American women artists in Paris during the 1880s.
Biography on Wikipedia: https://en.wikipedia.org/wiki/Sarah_Paxton_Ball_Dodson

Under the Weeping Ash Tree by Sarah Paxton Ball Dodson
1900 / Oil on canvas / 24″x18″ / Philadelphia Museum of Art, PA

Sarah Paxton Ball Dodson on Artnet: http://www.artnet.com/artists/sarah-paxton-ball-dodson/

Further reading:
http://arcadiasystems.org/academia/cassatt6b.html#dodson
https://www.bonhams.com/auctions/23917/lot/51/
http://collection.imamuseum.org/artwork/55841/