According to her Wikipedia article, she was a beauty who bore six children when she became the third wife of the 37 years old childless Duke Peter von Biron (see the 1783 group portrait for a corrected age).

ca. 1782 Dorothea, Duchess of Courland by Friedrich Hartmann Barisien (Muzeum Narodowe we Wrocławiu - Wrocław, Lower Silesia Poland)

1783 (before and before birth of 3rd daughter) Dorothea with her daughters, Wilhelmine and Pauline by ? (Rundāles pils muzejs - Pilsrundāle, Latvia)
