In 2017, Kerseboom wrote an opinion piece on the website ThePostOnline, in which she warned that "a shared national identity appears to be eroding rapidly" in the Netherlands. She wrote that "any remnants of national pride and values are systematically being replaced by a relentless
supranationalism accompanied by the
politically correct abstract concepts of
multiculturalism and diversity which threaten Dutch sovereignty and national cohesion by emphasizing the differences between citizens instead of celebrating what we have in common". Kerseboom joined
Forum for Democracy and was their second candidate in
Limburg in the
2019 provincial elections. The party, a newcomer, won seven seats, causing Kerseboom to receive a seat in the
States of Limburg. When FvD's lead candidate left the council to become a member of the
provincial executive, Kerseboom succeeded him as caucus leader. In November 2020, newspaper
Het Parool published an article about extremist ideas held by members of the party's youth wing, which caused a crisis within Forum for Democracy. Four out of the seven FvD members of the States of Limburg left the party, while Kerseboom expressed her continuing support for party leader
Thierry Baudet. Forum for Democracy announced the following month that Kerseboom would appear fifth on its
party list in the
2021 general election. She was elected, receiving 7,025
preference votes, and entered the
House of Representatives on 31 March. She kept her seat in the States of Limburg but stepped down as caucus leader. Kerseboom became her party's spokesperson for foreign affairs, foreign trade, education, culture, and science, and she is on the Committees for Education, Culture and Science; for Foreign Affairs; and for Foreign Trade and Development Cooperation. She is also part of the contact groups United Kingdom and United States and of the
Benelux Interparliamentary Consultative Council. Kerseboom temporarily stepped down as member of the House of Representatives and the States of Limburg starting on 16 August 2022 because of her maternity leave. She extended her House leave after 6 December, but she returned to the States Provincial after the sixteen-week period Her House leave ended on 28 March 2023. Kerseboom was the party's third candidate in the
May 2023 Senate election, and she announced that she would leave the House for a Senate membership – a part-time position – if she could not combine motherhood with a House seat. However, Kerseboom was not elected as her party won only one seat in the Senate, and she stayed in the House. She did not run for re-election in the
November 2023 general election, citing personal reasons, and appeared on the party list only as a . == Personal life ==