Next to her role as parliamentary leader, Bikker served as her party's spokesperson for health, welfare, sport, justice, security, the interior, Dutch royal family, and gas extraction in Groningen.

[5] A motion by Bikker was passed in early 2024 compelling Minister Franc Weerwind to make a spending cap on online gambling more stringent, after the practice was legalized in 2021.

[6] Along with Michiel van Nispen (SP), she announced a bill with several measures to tackle online gambling issues, including a ban on advertisements and credit card payments and increased contributions from operators toward addiction prevention.

At Bikker's initiative, a statement was signed by most political parties speaking out against it, and a session about the topic was held at the prime minister's official residence amongst industry leaders.

[8] Along with Frans Timmermans of GroenLinks–PvdA, she carried forward a bill to impose harsher penalties in cases of hate crimes, including acts of violence or insults motivated by discrimination.

[9][10] When the right-wing Schoof cabinet presented its 2025 budget that included €2 billion in education cuts, Bikker joined the self-named "unholy alliance" with centrist and conservative opposition parties.