Zella de Milhau (1870–1954) was an American printmaker, illustrator, ambulance driver, community organizer, and motorcycle policewoman. She studied at the Art Students League of New York and at William Merritt Chase’s Shinnecock Summer School of Art in Southampton, NY.
Biography on Wikipedia: https://en.wikipedia.org/wiki/Zella_de_Milhau

Boats Along Shore by Zella De Milhau
N.D. / Etching / Image: 4 1/2″ x 5 1/2″ / Private collection

Zella de Milhau on guildhall.org: https://pc.guildhall.org/artpress_artist/zella-de-milhau/

Further reading:
https://patch.com/new-york/southampton/from-the-archives-zella-de-milhau-was-conventionalitys-enemy
https://www.brownstonedetectives.com/miss-zella-milhaus-greenest-block-in-brooklyn-1902/
https://www.eastendbeacon.com/last-laff-for-art-villages-laffalot/

Shinnecock Summer School of Art: The Art Village: https://aaqeastend.com/contents/the-art-village/