In 1966 she joined the CDU in Cologne and in 1971 was appointed state secretary in Helmut Kohl's state cabinet of Rhineland-Palatinate, assigned to Culture Minister Bernhard Vogel, who became a close friend. From 1975 she also was an elected member of the Landtag of Rhineland-Palatinate. When Vogel became Minister-President in 1976, Laurien succeeded him as Minister for Education and Cultural Affairs.
Laurien in 1986
In 1981, she became Senator of Education in the West Berlin Senate under Governing Mayor Richard von Weizsäcker, where her firm appearance earned her the nickname Hanna Granata ("Hanna the Grenade"). When Weizsäcker was elected President of Germany in 1984, Laurien ran within the CDU against Eberhard Diepgen for the candidacy as succeeding Governing Mayor, but only came off second best. She nevertheless maintained her office as Senator and from 1986 to 1989 also served as Vice Mayor.[2] With Diepgen, Laurien had to resign from her office upon the 1989 Berlin state election.