I have been thinking a lot about this moment. I don't support violence and I don't think she should have been inside the Capitol -- as it was all a big setup for what is happening today.
That said, right before she was shot, someone says "He's got a gun" . There is a big guy in body armor and gun to the right of the video frame behind her.
I wonder is she heard this, saw the big guy with a gun, and then she jumped forward though to window thinking "that was the guy with a gun". She immediately tries to get away from the guy behind her, and unfortunately goes forward through the window.
I also believe the person who shot her should be tried for murder.
It would be a real shame if his entire hard drive was dumped into the public domain.