That video is so rich...so many layers. I have watched it on loop a hundred times before. Where are they? Court? Church? Look at that evil, shitty grin on the girl as she just stares at that lady. The sound of that punch is sweet, all flapping jowls. Love it.
Looks like the younger girl was wanting something that was disagreed on by the older woman that got punched. Almost looks like a retail outlet of sorts, and yes, I've seen a similar even in a shop, just because the guy was refused something.