She was Marshal of the Sejm from 25 June 2015 to 11 November 2015 at the end of the Seventh term's composition of the lower house, after which being voted a Deputy Marshal of the Eighth and Ninth term, each time nominated by the opposition party Civic Platform, under the marshalcy of Marek Kuchciński and Elżbieta Witek, respectively.

She was the Civic Platform nominee for Prime Minister in the 2019 Polish parliamentary election, losing to Law and Justice incumbent Mateusz Morawiecki.

Her father, Maciej Władysław Grabski, who came from a prominent Polish political family as a descendant of two notable politicians during the time of Interwar Poland, was a Professor of Technical Science for the Warsaw University of Technology and former President of the Foundation for Polish Science from 1992 to 2005, and her mother was Helena Nowakowska, was a former employee of the Press Workers' Cooperative and the winner in 1953 Fencing at the Kolejarz Sports Club where she met her future husband, who after the wedding devoted herself to running the house.

Maciej's father was Władysław Jan Grabski, a renowned writer who wrote historical novels on the History of Poland.

He was the second son of Władysław Grabski, noted politician, independence activist, and economist who served as Prime Minister of Poland for two non-consecutive terms plus was the author of the currency reform which contained hyperinflation and stabilized the zloty exchange rate until 1939, and his wife Katarzyna Lewandowska, a daughter of a wealthy landowner of szlachta descent.

Kidawa-Błońska's paternal grandmother was painter Zofia Wojciechowska-Grabska, the only surviving child of Stanisław Wojciechowski, who served as President of Poland from 1922 to 1926 after he was ousted by the May Coup d'État led by Marshal Józef Piłsudski, and his wife Maria Kiersnowska, who served as the First Lady during her husband's presidency.

She assumed that her house was an exhalation of rich, multi-generational prescription furnished with antiques, paintings drawn by her paternal grandmother, and photographs of her ancestors on the walls.

In 1927, her paternal great-grandfather received the permission for the construction of a residential house for his son Władysław Jan and his espoused wife Zofia Wojciechowska, after recently being married.

After the Warsaw Uprising, Zofia's parents, Stanisław and Maria, were taken to live in the Grabski house, after being rescued from the demolished city.

She went to classes at the Aleksander Zelwerowicz National Academy of Dramatic Art in Warsaw as a free witness out of interest, as she did not want to become an actress.

Jan recently graduated at the National Film School in Łódź and is the uncle of the deceased Ryszard Riedel, leader of Polish blues rock band Dżem.

Two days later, she was nominated by Civic Platform as a candidate for Marshal, she was elected to the office, by receiving 244 votes from the Sejm.

[6] On 3 September 2019, Grzegorz Schetyna announced that the Civic Coalition would nominate Kidawa-Błońska as its candidate for Prime Minister.

[13][14] On 10 March 2020, Kidawa-Błońska announced on her Twitter account that she would temporarily suspend large open conferences and introduce changes in the control of her campaign.