Although, lol, I can see how "no, you still can't have Silesia" might come across as "unforgiving" to Fritz partisans.

Indeed; this is the same ambassador who wrote "she does not deny your majesty's abilities, but she cannot forgive Silesia" in another dispatch. Basic attitude: why does she keep making a fuss about what we've rightfully stolen, and anyway, it's unwomanly! Why she doesn't spend three hours a day on her make-up and hair style (this was the non-MT avarage for a noble lady in Vienna at that time) is beyond me, unless she really wants to be a man, amirite?