Not posting the video directly because its violence/shooting, but this reddit thread with embedded video is the clearest view of the woman getting shot.
https://old.reddit.com/r/PublicFrea...est_view_of_a_terrorist_attempting_to_breach/
Looks like the area was the area in which the politicians were gathering/being evacuated from, which included VP and VP-elect. Unknown who was in the room directly behind the agent that fired the shot. The doors were barricaded with some smashed glass, a large crowd was on the other side, the woman attempts to hop through the smashed glass and enter the corridor, as she does the office fires a single shot. The crowd begins to freak out like they couldn't understand why someone just got shot. What is ridiculous is there is a significant amount of police within the large crowd, with long guns, not doing anything.