A genealogical sketch for Princess Maria Josepha is here.
This image is available only in 435 X 660 pixel or smaller sizes. I took a 435 X 660 image from costumeantique.de/data/kostuem/rokoko/1784_Johann_Georg_Weikert_-_Unkown_Woman, downloaded it, turned it 90° and then expanded it to fill the screen. Then I took a screen shot, flipped it back, and posted it. Substantial enlargements often don’t work, but this one did.