Lucia Fairchild Fuller (December 6, 1870-May 21, 1924) was an American painter and member of the New Hampshire Cornish Art Colony. She was a founding member and treasurer of the American Society of Miniature Painters.
Biography on Wikipedia: https://en.wikipedia.org/wiki/Lucia_Fairchild_Fuller

Clara B. Fuller by Lucia Fairchild Fuller
1898 / Watercolor on ivory / 4-1/2″x2-13/16″ / The Metropolitan Museum of Art, NYC

Lucia Fairchild Fuller on Artnet: http://www.artnet.com/artists/lucia-fairchild-fuller/

Further reading:
http://americancenturies.mass.edu/collection/itempage.jsp?itemid=194
https://arthur.io/art/lucia-fairchild-fuller/women-of-plymouth
https://asllinea.org/lucia-fairchild-fuller/