She was the niece and lover of Grigory Potyomkin, and the favored lady-in-waiting of Catherine the Great.
Alongside her sisters, she was given a favored position at the Russian Imperial court during the reign of Catherine, where they were described as "Almost Grand Duchesses", the jewels of the court and honorary members of the Imperial family.
This is an illustration from the book Russian portraits of the 18th and 19th centuries: Edition of Grand Duke Nicholas Mikhailovich of Russia, printed in 1905-1909 as a catalogue of a 1905 exhibition. All images are in the Public Domain due to age.