As the king was unmarried and there was no queen, his favorite niece Urszula Zamoyska often played a ceremonial role by his side, and accompanied him in public.

Described as a haughty beauty, she played the role of hostess at the royal court of king Stanisław and was a leading figure in the aristocratic high society life of Warsaw.

[2] [3] On their return to Poland, she was the hostess on the king's meeting with emperor Joseph II, during which she staged plays and ballets for his amusement.

During the Great Sejm (1787-1791), Julian Ursyn Niemcewicz's political comedy, The Return of the Deputy (1790), was performed in her salon.

In the spring of 1791, she and her mother visited Paris during a difficult period in Poland, which attracted bad publicity.

On 7 January 1795, she and her family joined king Stanisław in Grodno, and remained by his side during the Third Partition of Poland.

After the death of her uncle the former king in 1798, Urszula Zamoyska returned to Poland and settled with her spouse in Wiśniowiec.