She is right handed.
The object in her left hand is not the gun.
I'm not certain what it is, because the "knife" theory certainly has a few frames that look like evidence. But the other frames make it appear that whatever is in her hand is flexible, such as a fabric of some sort.
And yeah Corvis, I'm overthinking.
It turned out just as predicted.
I just didn't think it would be that easy.
Now about that Grassy Knoll...