Police did it. Most have said Capitol Police. Here’s what some witnesses who were next to her had to say.
https://twitter.com/dhookstead/status/1346928845665001476
This shows how she was shot. She’s the one with the blue jeans, tan colored boots and Trump flag.
https://banned.video/watch?id=5ff63502f23a18318ceb28a7
Looks like she was climbing through the broken window when she was shot.