She appears to target specific men too and manages to drive the crowd back from whatever is going on in the car and in the background.
Admittedly the camera / phone swings around a bit so you don’t see everything she does but I disagree about the targeting. It looks indiscriminate to me (from this limited viewpoint).
There is at least one other colleague who has his pava in hand at the end of the clip but doesn’t appear to have felt threatened enough to actually spray it (or it’s just not captured in the footage) and a couple of batons drawn which, again, don’t appear to have been used.
It’s notable that the older / more experienced (and incidentally armed) officers in the footage haven’t deployed batons, sprays or tasers and look pretty chill. It’s the YTS-age plods that are rattled and who have weapons in hand.