This is her English-language Wikipedia article. It is very interesting and it even has a note of scandal: "She was the daughter of Count Georg Detlev von Flemming (Polish: Hrabia Jerzy Detloff Fleming) and Princess Antonina Czartoryska. On 18 November 1761, in Wołczyn, she married Prince Adam Kazimierz Czartoryski, thus becoming a princess.
She was rumored to have had an affair with the Russian ambassador to Poland, Nikolai Vasilyevich Repnin, who was alleged to have fathered her son Adam Jerzy Czartoryski.
In Paris in 1772 she met Benjamin Franklin, subsequently a leader of the American Revolution, and the French philosophers Jean-Jacques Rousseau and Voltaire, who were bringing new ideas to the old order.
In 1775, together with her husband, Czartoryska completely transformed the Czartoryski Palace at Puławy into an intellectual and political meeting place. Her court was one of the most liberal and progressive in the Commonwealth, although some aspects of her behavior also caused scandals...
While in Prussia with her daughter Maria Wirtemberska for the latter's marriage, she told Frederick II of her fears that her husband would be poisoned, which was what had caused a split between him and Stanisław August Poniatowski politically. Frederick laughed and told her that only monarchs were poisoned, and spread the conversation around his court to Izabela's detriment, according to Wirydianna Fiszerowa.
In 1784 she joined the Patriotic Party. After the suppression of the Kościuszko Uprising, her sons Adam Jerzy and Konstanty Adam were taken as political hostages by Russia's Empress Catherine II.
In 1796 Izabela ordered the rebuilding of the ruined palace at Puławy and began a museum. Among the first objects to be included were Turkish trophies that had been seized by Polish King Jan III Sobieski's forces at the 1683 Battle of Vienna. Also included were Polish royal treasures and historic Polish family heirlooms. In 1801 Izabela opened the Temple of the Sibyl, also called 'The Temple of Memory.' It contained objects of sentimental importance pertaining to the glories and miseries of human life. During the November Uprising in 1830, the museum was closed. Izabela's son Adam Jerzy Czartoryski, going into exile in Paris, evacuated the museum's surviving objects to the Hôtel Lambert. His son Władysław Czartoryski would reopen the museum in 1878 in Kraków, where it exists today."
This is Izabela Czartoryska, née Fleming and not Isabella Lubomirska, née Czartoryska.