Found these three photos in a photo lot I purchased on eBay here in Germany. None of the photos bear any clues as to who she was. The only clue lies in the location where the first photo was printed, it says Bissingen (in Bavaria, Germany). Nothing else, as if her person is lost to history forever, her happy smile is the last memory of her.

Judging from her fashion style, here she is what looks to be in the 1910s, 1920s and in the 1940s.  The same smile. The same front wave in her hair.
Please let me know should you recognise her or her beau.