Even though there seem to be records from Bremen in the database -- it comes up with quite a few possibilities -- I can't see that any of them could be her (though I rejected a possibility for Joseph Ortmann that then turned out to be true). None of them has a birthdate of Dec. 25, which would kind of jump out at you.
One of the problems is the name: Schulze. It's a common name, as you can see in this map of where the name comes up:
And if you add in the spelling variants -- Schulz, Schultz, Schultze, Schult, Schulte, and so on -- it seems as if every other person in Germany has that name.
I've also searched on Wilhelmine's sisters, Marie and Sophie, and come up with nothing so far, even though I know the names of Sophie's husband and children. So I started thinking about the names.
When you look at the names of Wilhelmine's sisters, it's interesting -- Grandma's full name was Sophie Bertha Marie, and Wilhelmine's two sisters were Sophie and Marie. (It seems like she felt she needed to load Grandma up with all the names -- ) I wonder where the Bertha came from; could it have been Wilhelmine's mother? The woman we were wondering about in the photograph we looked at?
Was her name Bertha? I searched for that name -- and found that if Schulze was common, Bertha Schulze was common as well. I'll pursue it further, and see if I can come up with a connection. And now I think we can identify the three middle-aged women as Wilhelmine, Sophie, and Marie Schulze:
I hope this is right -- but can I ever really know? We'll see.