 On 9 March 2001, Roth was elected Federal chairperson of Alliance 90/The Greens at the party conference in Stuttgart and resigned as a Member of the Bundestag at the end of March 2001 as a result.At the same time, she was spokesperson of the Alliance 90/The Greens on women's affairs.In the 2002 national elections, Roth was elected to the Bundestag as Bavarian lead candidate for Alliance 90/The Greens.