Lena Vogt:
lol apologies for double post, but does Lena know who Eva Braun is, because she's famous now, but I don't know how much they knew about her at the time.
Lena might know something from a spy dossier but I'm not sure how much to assume.
In 1943, Eva's position was still a secret. There may have been some whispered rumors, but amongs the general population, Hitler was see as the "ultimate bachelor".