Dorothea: yes, German wiki says she married a spice trader named Franz Heinrich Schommer and had six kids by him. She died in 1762, in Berlin, Behrensstraße.

Yes, Voltaire offering this play to Catherine, of all the people, was...special. This trailer, btw, for the Russian Catherine miniseries does a superb job of wanting me to watch said show and sum up her rise to power. (Oh, and the nominated Poniatowski also shows up, identified by name in the trailer.)