Spaak started her career in politics after her father's death in 1972 within the regionalist
Democratic Front of Francophones (, FDF), which purported to represent the interests of French-speakers in
Brussels amid the
ongoing political struggles between linguistic groups in Belgium which had emerged in the 1960s. She was elected to the
Chamber of Representatives in the
1974 elections and became president of the FDF in 1977, becoming the first woman in Belgian history to lead a political party. An advocate of European integration, she was voted into the
European Parliament in its
first direct elections from 1979 to 1984 and again from 1994 to 1999. She was granted the honorary title of
Minister of State in 1983. She presided over the
Council of the French Community from 1988 to 1992. As the FDF's electoral fortunes declined in the 1980s, Spaak played a leading role alongside
Jean Gol in arguing for conciliation between the FDF and the
Liberal Reformist Party (, PRL). This led to an
electoral alliance in 1995 between the FDF and the PRL, which was later joined by the
Citizens' Movement for Change (, MCC). The FDF-PRL-MCC stood a joint list in the
1999 election, which paved the way for the formation of the
Reformist Movement (, MR) in 2002 as a single political party. Spaak was a candidate for the MR in the
2007 elections at the bottom of the list and was not elected. However, she was elected to the
Parliament of the Brussels-Capital Region in 2009 but resigned after less than a year. The coalition of interests within the MR collapsed in 2011 amid a dispute on the linguistic status of the region dubbed
Brussels-Halle-Vilvoorde, and the FDF seceded, rebranding as DéFI in 2016. == Personal life ==