Schubert studied political science, sociology and economics at the University of Bonn from 1981 to 1989, graduating with a master's degree.

She then became personal assistant to Vice-President of the Bundestag Petra Bläss until 2001, and from May 2001 to October 2002 an advisor to the executive committee of the PDS group.

From 2004 to 2012, she was personal secretary to various senior PDS politicians in Berlin; firstly Harald Wolf, Senator for Economics, Labor and Women.

[5] On 6 December 2007, Schubert filed a criminal complaint against the Wikimedia Foundation due to "the use of anti-constitutional symbols" on German Wikipedia.

[6] Specifically, she cited the displaying of Nazi iconography on articles, such as that of the Hitler Youth, claiming that it "goes beyond what is needed for documentation and political education".

She stated that she was concerned about how platforms such as Wikipedia could be exploited by far-right extremists to promote their views, and hoped to spark a public debate about the issue.

Fellow Left politician Heiko Hilker rejected Schubert's position, saying that "she fails to grasp the self-regulating mechanisms that work in Wikipedia.