One doesn't have to "trust books." Annalen der Physik has actual copies you can go look at. Her name is not on them.

As I said, however, there exists a Russian translation that includes his wife's name. He *DID* do research with her. We know this very well. We do not know the extent to which she worked with him, but she certainly never claimed to have done work with him.

Though Einstein was a patent clerk, he had enormously impressed his professor. He and his wife had already done research on capillary action and while not exactly well-known, was at least well-respected in a small circle because of this earlier work.