The radio newscasters were spinning it like this is the crucial point on which the case hinged, that the jurors mostly decided she planned it based on a "Law and Order" episode that never aired. It sounded a little weak to me.
In Texas it is far harder to successfully plead insanity as a defense to a crime. In our state, if you know right from wrong, it doesn't matter whether you couldn't control your actions or even delusional.
Andrea Mitchell knew what she did was wrong. She called 911 to report it. It doesn't matter what some investigator saw on a TV drama show or whether Andrea did.