Harriet Ellen Siderowna von Rathlef-Keilmann (January 3, 1887-May 1, 1933) was a German sculptor.
Biography on Wikipedia: https://en.wikipedia.org/wiki/Harriet_von_Rathlef
Pair of rabbits modeled in stucco / 1909
Below Left: Pieta wood relief / 1924
Below Right: Wooden sculpture / N.D
Lost Art Database:
http://www.lostart.de/Webs/EN/Datenbank/ObjektgruppeVerlust.html?cms_param=OBJGRP_ID%3D8998%26page%3D0%26sort%3D%24sort
Further reading:
https://www.meaus.com/harriet-siderowna-keilmann.htm