I feel the need to point this out. The only bit of this footage that's been widely circulated is the part where she takes the punch. Before that, she runs up to the mob, stopping at the outer edge, looking around. Then Nathan Damigo ran up to her, all the way from the middle of the crowd & threw the first punch, that bit where it looks like she's reaching for his throat was her pushing him off. If you pay close enough attention at the beginning, you'll notice he actually had to maneuver around people to get to her specifically.
I have no way of knowing what happened before this, but the convenient neglect of the facts laid before me in this video puts what I've been hearing about this into question.