UN Resolution language (1999):
"1. Strongly condemns all acts, methods and practices of terrorism as criminal and unjustifiable, wherever and by whomsoever committed;
2. Reiterates that criminal acts intended or calculated to provoke a state of terror in the general public, a group of persons or particular persons for political purposes are in any circumstance unjustifiable, whatever the considerations of a political, philosophical, ideological, racial, ethnic, religious or other nature that may be invoked to justify them". (GA Res. 51/210 Measures to eliminate international terrorism)
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Short legal definition proposed by A. P. Schmid to United Nations Crime Branch (1992):
Act of Terrorism = Peacetime Equivalent of War Crime
Academic Consensus Definition:
"Terrorism is an anxiety-inspiring method of repeated violent action, employed by (semi-) clandestine individual, group or state actors, for idiosyncratic, criminal or political reasons, whereby - in contrast to assassination - the direct targets of violence are not the main targets. The immediate human victims of violence are generally chosen randomly (targets of opportunity) or selectively (representative or symbolic targets) from a target population, and serve as message generators. Threat- and violence-based communication processes between terrorist (organization), (imperilled) victims, and main targets are used to manipulate the main target (audience(s)), turning it into a target of terror, a target of demands, or a target of attention, depending on whether intimidation, coercion, or propaganda is primarily sought" (Schmid, 1988).
http://www.unodc.org/unodc/terrorism_definitions.html
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There is a difference between a terrorist and a normal criminal. What you engage in is again a very common thing among liberals and Germans, moral relativism. You use "polemics" to argue, not facts.
She is a terrorist. She is a terrorist under the laws of any Western state. The first thing you attempt to do is to sanitize the language, typical of socialists. Let's not call her a terrorist but a criminal. No, she is a terrorist, got it?
Secondly, when she was incarcerated it was with the expressed intent to lock her up forever. It was more or less understood that these people should never be let out again, which is exactly what is not happening right now.