Between 2002 and 2005, Deligöz served as Chief Whip of the Green Party’s parliamentary group. From 2009 until 2013, she part of the group’s leadership around co-chairs Renate Künast and Jürgen Trittin. In this capacity, she was part of a series of round table talks in 2010 and 2011 to tackle a wave of child sexual abuse cases, including numerous allegations of abuse in the Roman Catholic Church; the talks were jointly chaired by ministers Sabine Leutheusser-Schnarrenberger, Annette Schavan, and Kristina Schröder.