Jacqueline Marval was the pseudonym for Marie Josephine Vallet (October 19, 1866-May 28, 1932), who was a French painter, lithographer and sculptor.
Biography on Wikipedia: https://en.wikipedia.org/wiki/Jacqueline_Marval

La belle Gretchen by Jacqueline Marval
ND / Oil on canvas / 24″x19-3/4″ / Private collection

Jacqueline Marval on Artnet: http://www.artnet.com/artists/jacqueline-marval/

Further reading:
https://www.jacqueline-marval.com/biography
https://awarewomenartists.com/en/artiste/jacqueline-marval/
https://www.museemusings.com/home/jacqueline-marval