In 2020, it was announced that Van der Werf would run in the
2021 general election. She was the ninth candidate on the party list, six places below her initial third place on the draft version of the list. She was elected, receiving 13,935 preferential votes, and was sworn into the House of Representatives on 31 March. Van der Werf vacated her seat in The Hague council in April. In November 2021, she pled for a central point to aid victims of sexual violence and child abuse. A
motion led to an investigation into establishing such a point. An
amendment by Van der Werf was later passed to make
revenge porn a sex crime, having before been classified as a privacy infringement. In June 2023, she launched a
manifesto against aggression and violence together with
Joost Sneller (D66). They responded to a perceived hardening of society causing increased hate and aggression, targeting those who serve society in particular. The document called on society, employers, and the government to act, and it was signed by most parties in parliament as well as several professional associations and labor unions. Van der Werf was appointed national campaign leader of D66 in May 2022 ahead of the
2023 provincial elections. She temporarily left the House of Representatives starting 2 October 2023 due to her
parental leave. Van der Werf returned on 29 March 2024 following
her re-election in November 2023, and her specialties changed to defense, security, sex crimes, digital affairs, pensions, and benefits. Along with
Barbara Kathmann (
Labour Party), she advocated for an
age rating system for
social media platforms to protect children against
negative effects. Van der Werf later called for a full ban on social media use by those under the age of 15, enforced through an
age verification system.
Committee assignments 2021–2023 term • Committee for Digital Affairs • Committee for the Interior • Committee for Justice and Security • Delegation to
Europol's Joint Parliamentary Scrutiny Group
2023–present term • Committee for Justice and Security • Committee for Digital Affairs • Committee for Defence == Personal life ==