I find her size to be relevant, and I'm normally opposed to hitting women, as they are normally, even if they are the same height as a man, much physically weaker. I've known women as tall and nearly as tall as me, and not a one of them could punch me in a way to hurt me.
That being said, perhaps a glass bottle would change my outlook in the moment.

I add to that the fact that she openly declared her intent in going there was to attack demonstrators, and the avowed purpose of the organization she was with is to do violence.
She was, "Heading to Berkeley to disrupt the white supremacist/neo-nazi circle jerk today. Nervous af but determined to bring back 100 Nazi Scalps today." She went wearing a glove (we could inquire what kind of glove that was - was it weighted?)
Her organization has signs, also, depicting a figure assaulting an Immigration and Customs Enforcement agent with a baseball bat. Now, her expression of intent and the signs her group puts up does not mean she's fair game to be attacked. What it shows, to me, is some objective evidence of her subjective intent in being where she was in the first place, and it provides context. After the event, she was interviewed, and she said that the only time she was holding a bottle was to clean up the trash. From the video I've seen, etc., it does not look like she was playing maid to the protests at the time of the event, and a Reuters picture shows her holding a bottle and there is video evidence of her swinging a bottle, not cleaning up the trash. But, again, inconclusive.
To be conclusive, I think we need some additional evidence as to what went on in the seconds leading up to the incident.
If she was wielding that bottle, then it's certainly possible the punch came as a response to the idea of being hit by it. Also, if the lead-up to the punch shows that she is throwing glass bottles at people, then action should be taken against her to stop it (and I make no reference to any allegation about putting M-80s in the bottles - just plain old glass bottles are weapons in situations like this, or when thrown).
If that position is "unsurprising" - then I take it as a compliment.