In the 2013 elections, Amtsberg was elected into the Bundestag for the Green Party in Schleswig-Holstein. In parliament, she has been a member of the Committee on Internal Affairs since 2014. In this capacity, she is also her parliamentary group’s spokesperson on refugees. From 2014 until 2017, she also served on the Committee on Petitions. In 2017, she ran again on list position 1 and as a direct candidate in the constituency of Kiel 5 and was re-elected.