Between 1993 and 1996, Collin-Langen headed the department for legal affairs and human resources at the Investment and Economic Development Bank of Rhineland-Palatinate (ISB).
In addition to her committee assignment, Collin-Langen was a member of the Parliament's delegation to the EU-Armenia and EU-Azerbaijan Parliamentary Cooperation Committees and the EU-Georgia Parliamentary Association Committee.
Within her party, Collin-Langen is a member of the CDU leadership in Rhineland-Palatinate under chairwoman Julia Klöckner. Since 2001, she has also been serving as chairwoman of the Frauenunion in Rhineland-Palatinate, the women's group of the CDU.
In August 2018, Collin-Langen announced that she would not stand in the 2019 European elections but instead resign from active politics by the end of the parliamentary term.[3]
In 2013, several members of the European Parliament's India Working Group filed a complaint after Collin-Langen. Together with MEPs Lena Kolarska-Bobińska and Kinga Gál they are alleged to have used a 50-seat bus to go shopping during an official delegation trip to Kolkata.[5]
On 18 June 2015 Collin-Langen resigned from a secondary employment as a member of an advisory committee for the energy company RWE after criticism from LobbyControl on the publication day of a study[6] that had been published by Lobby Control in collaboration with Corporate Europe Observatory and Friends of the Earth Europe. Criticism aimed at her advocating for RWE-friendly positions in the EPCEPHFS.[7][8]
^Whose Representatives? MEPs on the industry payroll, A report by Friends of the Earth Europe, Corporate Europe Observatory and LobbyControl. Written and researched by Rachel Tansey. Contributions from Paul de Clerck, Olivier Hoedeman and Nina Katzemich, June 2015, accessed on 22nd of June 2015