Margery Austen Ryerson (September 15, 1886-1936) was an American artist, painter, etcher, lithographer, and watercolorist. Ryerson was also involved in the creation of two well known art instruction books.
Biography on Wikipedia: https://en.wikipedia.org/wiki/Margery_Ryerson

Big Sister by Margery Ryerson
ND / Drypoint / 10″x6-7⁄8″ / Smithsonian American Art Museum, DC

Margery Ryerson on Artnet: http://www.artnet.com/artists/margery-austen-ryerson/

Further reading:
https://emuseum.delart.org/people/1696/margery-austen-ryerson/objects
https://brierhillgallery.com/margery-austen-ryerson
http://www.jamescoxgallery.com/artists/estates-collections/margery-ryerson/