After the fall of Communism, she was the chairwoman of the Polish Robert Schuman Foundation, a non-governmental organization promoting European integration.

[1][2] Her father, a Polish nobleman, Jacek Woźniakowski (1920-2012), was a professor in the Catholic University of Lublin (who also served as Mayor of Kraków for 1990-1991).

In 1990, when her husband succeeded as the Head of the family and nominally became Fürst, her style changed to Rosa Fürstin von Thun und Hohenstein.

Citing disagreements over key policy areas like environmental protection, Thun left the Civic Platform, and later also the European People’s Party group, to join Poland 2050 and Renew Europe in 2021.

[11] "And so, the voters will see Róża Maria Gräfin von Thun und Hohenstein in her full grace",[11] Czarnecki wrote.

[12][13] On 20 May 2009, it was revealed that Czarnecki himself would appear on the ballot sheets not under his assumed Polish name of Ryszard Henryk, but as Richard Henry, since he was born in the United Kingdom.

[13][14] Czarnecki stated that his situation is different, as he didn't choose his names, while Thun chose her surname by marrying her husband.

[14] In January 2018, Czarnecki compared Thun to a szmalcownik, people who blackmailed Jews in hiding during the Holocaust, for her criticism of the Polish government.

[16] Shortly after, her political opponents had pictures of Thun and five other Polish politicians strung from a makeshift gallows in a public square in Katowice.