Is the rationality or maturity of this individual important in a judicial context?
In the tradition of the Law, in the West, there is a long history of the principle that the state of mind of an individual has a bearing on the question of that persons culpability, and indeed upon the question of what punishment should -with justice- be brought to bear.
The lack of
mens rea (Latin legal term for "guilty mind") or a person being
Non compos mentis (Latin legal term meaning "not of sound mind") are concepts which are directly concerned with the state of mind of a person who is being judged. And it is the case that the young are given special consideration by the law.
It is in accord with the wish to live in a just society that this should be the case.
The rationality and the maturity of Linda Wenzel, or the lack of those qualities, are and ought to be important in a judicial context. Further exactly what her actions were, as opposed to what we might guess her actions were, is relevant.
On the field of battle we may kill our foe when under threat, with the most extreme prejudice, but having captured our foe, we hold our selves to a higher standard. We do so out of a concern for our own decency and virtue.
It is beneath us to do otherwise.