Unresolved thread: the aborted marriage. Judging by Wilhelmine's memoirs, she didn't want to break her sworn word to the future Margrave, *but*, she also didn't have a very good reason to do so (like "I can join not-dead-after-all Fritz in exile!"), and also, her fiancé seemed willing to let her off the hook rather than make her unhappy. So I think maybe we're okay there.

Also, maybe you could have her promising Fritz something like, if he was ever free, she would join him. Or something. Then both he and future Margrave can argue that the earlier promise took precedence! (in my head there is a moving scene between W and Bayreuth Friedrich where she is distraught about breaking her sworn word and BF all nobly says something like, "Then I will break it," and lets her go to be with her first love)