Actually you have no idea what your daughter does, and it's probably better that way.
I'm not defending an obnoxious drunk. Throw her out of the game, arrest her, whatever. I'm just saying a cop who looks like an NFL defensive lineman has no business hitting a defenseless woman with his fist while she is being held by other cops. That is such an obvious conclusion I am shocked that any of you could doubt it.
She maybe brushed his face as she was being slung around by the other cops. To call that an assault is ridiculous.
Excusing this kind of blatant police overreaction does no one any favors, least of all the cops who somehow think this kind of abuse is ok. At a minimum this cop lost his cool, which is bad enough, or perhaps he thought, now I have an excuse to tune up this bitch. Either way, he should be fired and prosecuted.