Cläre (M.C = Marie Claire) Schmidt-Weissenberg, known by just a handful of colour woodblocks is an obscured  Dresden printmaker. She was probably the daughter (or wife) of Dr. Kurt Schmidt a neurologist and sanatorium director in Colmnitz near Dresden.  The Weissenberg could be added to the common “Schmidt” family name for “distinguishing” reasons. 

A print (surfacing in America) showing Bald Head Cliff in York (Maine  - America) suggests she visited the USA.