I have seen several Clips from different angles, and to me it does not look like she is pushed down.
In that processed clip, to me it looks like the police officer behind her tackles her and ends up pulling/pushing her down, but I'm reserving judgement until I see it at clearly natural speed, with more context. The low frame rate isn't sped up (I think), but gives the impression of it being a slow-motion replay of something faster, making it look faster.
Doesn't seem like clearly excessive force - they DO have to actually be able to restrain her, and she's not making it easy for them.
Going back a bit, to this key question:
Should they just have let her do whatever she wanted? At what point do you think it would have been reasonable to restrain her?
In this case the point of the action is the reaction - in this case the reason to attempt to breach security is not to do direct harm, but to provoke a reaction which can then be used.
Something on that topic here, published the other day: https://newdiscourses.com/2023/03/mid-level-violence/
In this strategy, agitators will engage in behavior that, if accepted, moves one of their mass-line agendas along or that, if resisted, provokes a reaction that can be framed as an unjust overreaction (“wound collecting” or “crybullying”). They are masters at this. In fact, it’s Antifa’s bread-and-butter tactic, and its goal is always to put its target into a dilemma of giving in and demoralizing themselves or reacting and thus being portrayed as having overreacted.
But of course the security and police can't rely on that - they can't rely on attackers simply being provocateurs trying to get a security reaction - they do have to actually do what is necessary to defend the women and hold people back. Even when the attacker is also a woman - a "block aggressors unless they're women" strategy has a fairly clear exploitable safeguarding loophole!
The presence of police and security does sadly let the provocateurs push their luck even further though - they know they wouldn't be able to get away with that sort of direct scuffle with total civilians - rather you'd see the sort of "I'm not touching you!" in-your-face thing described in that New Discourses segment; you may recall it from the anti-Dave Chapelle protest involving tambourine exorcism woman.