Apparently, the Texas Ranger will be testifying again today. This time for the defense. If he testifies that her actions against the perceived threat were reasonable, I could see a not guilty verdict being possible.
If he is allowed to testify like that, the prosecution will just bring in all the other investigators who contradict his opinion. It will be a sh!t show. The Rangers opinion makes for good TV, but is irrelevant. He is a finder of fact, not an adjudicant. In addition, his opinion was formed over a year ago, so it is severely biased and prejudged, without all of the evidence, etc. Kinda like all the rest of us.
Everyone has opinions, even the judge. She will not testifying to her opinion.
In Texas, Grand Jury's determines charges, so only their opinion matters. And it does not have to be unanimous. So there might GJ'ers who did not think she should be charged. They will not be testifying their opinion either.