Heil first became a member of the Bundestag in the 2009 German federal election.[2] She served on the Committee on Labour and Social Affairs (2009-2010) and the Sports Committee (2009-2013) before moving to the Committee on Legal Affairs and Consumer Protection 2013.[3]
In the negotiations to form a Grand Coalition of the Christian Democrats (CDU together with the Bavarian CSU) and the SPD under the leadership of ChancellorAngela Merkel following the 2013 elections, Heil was part of the CDU/CSU delegation in the working group on the environment and agriculture, led by Katherina Reiche and Ute Vogt. In similar negotiations following the 2017 federal elections, she was part of the working group on internal and legal affairs, led by Thomas de Maizière, Stephan Mayer and Heiko Maas. From 2018 to 2021, she chaired the Committee on Building, Housing, Urban Development and Local Government.