I believe that Nightjar has identified the "mystery" girl correctly as Magda Polak. Facial features, breasts, etc all look right, but her arms are always covered and we cannot see her distinctive tattoo.
http://www.iafd.com/person.rme/perfi...agda-polak.htm
I didn't see the "mystery" scene in the streaming copies of "Die Braut die sich nicht traut!" that I was able to find, but it can be found using this search term.
video28841523/rosenbergporn0562_02
Other opinions?