Greta moved back to Wisconsin following the election of Donald Trump, because she understood Wisconsin's pivotal role in securing his victory and felt a duty to bring her organizing skills to restoring Wisconsin's democracy. She served as a legislative aide, volunteered on a campaign and was then elected to represent the 66th District in the Assembly in early 2018.

While in the legislature, she has served on the powerful Joint Finance Committee, responsible for crafting the state budget, the Governor's Task Force on Climate Change and the Mayor's Task Force on Police Reform. She organized a statewide effort to expand healthcare access, wrote policy on everything from supporting the LGBTQ+ community to addressing climate change, and continues to do all she can to deliver results for Racine County.

She has focused on restoring Wisconsin's democracy through the fight for fair legislative maps. She knew the issues facing our communities could never be adequately addressed while legislators were not being held accountable at the ballot box. She witnessed how the Republican majority was insulated from public opinion by an extreme gerrymander in what experts described as a "democracy desert". After many years of hard work by people across the state, Wisconsin finally won fair maps earlier this year.

Greta was unanimously elected by her colleagues to serve as Minority Leader in January of 2022. In this role, she coordinates the strategy for the Assembly Democrats and works with partners across the state to build a Wisconsin where we all can thrive. She also leads the Assembly Democratic Campaign Committee, which successfully prevented a Republican supermajority in the Wisconsin State Assembly in 2022, maintaining Governor Evers' veto power. With fair maps in place for the upcoming elections, she is working to win the first Democratic Assembly Majority in Wisconsin in well over a decade.