She grew up in and around Dresden, and when her parents died she went to live with her uncle in Berlin. He was the Saxon Minister to Prussia, and he was married to a widow of one of the last German Electors.
What!!!???
I can't believe I've overlooked the fact that Elector Wilhelm II of Hesse-Cassel after his abdication married a second morganatic wife, Karoline von Berlepsch, who was 43 years younger than him and was made Baroness and then Countess of Bergen (a Hessian small town, now a suburb of Frankfurt and married to this Count Karl-Adolph von Hohenthal in her second marriage)!
Those Hesse-Cassels really were quite wonderfully impossible.