She was compelled to enter politics after living and studying in the Netherlands in the early 2000s, during which time she witnessed the conservative shift in society which followed the assassination of Pim Fortuyn.

[4][5] In October 2015, Kapek was nominated as part of a four-member team of lead candidates for the 2016 Berlin state election alongside Bettina Jarasch, Ramona Pop, and Daniel Wesener.

[18][19][20] In 2017, Kapek proposed the introduction of a fare-free student ticket for public transit, stating this would ease the burden for "very, very many Berlin families".

[22] She also called for a new funding model to expand public transport and close gaps in the existing network, suggesting the introduction of a general "citizen ticket" paid by all Berliners, and potentially a congestion charge.

[23] Kapek advocates socially responsible urban development that makes the preservation of "Berlin's lively blend of people, architecture, art, and culture" the basis of future policy.

She views public participation as a key tool to involve people in the process of change, and for avoiding conflicts over the development of neighbourhoods.

[27] In response to the state of the Berlin housing market, Kapek has called for tightening of tenancy laws and expansion of tenant protection.

[28][29] Kapek has repeatedly spoken out against building on the edges of Tempelhofer Feld, and defended the results of the referendum on the area, which saw 64% of voters support restricting development in the park.

Kapek advocates further developing Tempelhofer Feld as a "Central Park", and has repeatedly suggested that a swimming lake be created in its centre.