Here is my take on this, not knowing the full story.
There are definitely some lessons to be learned here. I try to put myself in the position of the gun lady.
Someone screaming at you, and making verbal threats, is not enough to pull your gun in Texas. (Stay with me a sec. Lol)
The question is: Would a reasonable person be afraid of severe bodily harm, or death from the perpetrator? If she did feel that way to get her to pull the gun, there will have to be proof. Her screaming and emotional response doesn't look like she was in a reasonable state of mind.
If she felt threatened with severe bodily harm, she could have stayed inside the vehicle as the castle laws apply. But, the second she got out, AND pulled a gun, castle laws be damned.
So.qe have to ask ourselves: if this happens, is it worth giving up everything for something that really doesn't matter in the end? I mean, she called her names, slapped the window, blocked her from leaving, is demanding, and you go to jail over that?
Just saying . . .
Don't get suckered!