Zrihen was elected to the municipal council of La Louvière, Belgium in the municipal elections in October 2000, by then as a French citizen. She was re-elected in 2006, and became deputy mayor in 2007.[5]
She became a member of the European Parliament in April 2001,[6] not reelected in June 2004, this time after having acquired Belgian citizenship. A few months later though, she was coopted to the Belgian Senate to replace Philippe Busquin, who was elected to the European Parliament, and in 2007, she was elected to it.[7] She is a member of the International Council of Jewish Parliamentarians[8] and in March 2002, she supported an appeal in favour of Israeli membership of the European Union.[9][10]
Elected in 2009 as a member of the Regional Parliament of Wallonia, Zrihen replaced Joëlle Kapompolé as a senator for the Walloon community until 2014. She was also the vice-president of the Parti Socialiste between 2011 and 2014.[5]
She has been awarded with the Order of Leopold twice, once in 2007 as a Chevalier, and in 2014 as an Officier.[2]
- 2001: Municipal councillor of La Louvière
- 2001–2004: Member of the European Parliament
- 2004–2007: Senator, coopted
- 2007–2009: Senator, directly elected
- 2006–2009: Deputy mayor of La Louvière
- 2006–: Municipal Councillor of La Louvière
- Member of the Waloon Parliament since June 30, 2009
- Senator for the French Community:
- June 30, 2009 to May 7, 2010
- July 7, 2010 to May 25, 2014 (replacing Joëlle Kapompolé)
- Since June 23, 2014 (appointed by the Walloon parliament) Vice President of the Senate
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