So frustrated or maybe it was just my hormones....

I've always liked being around kids they don't usually bother me but last night i was so frustrated with these 2 little girls. We were my husbands soccer game & we always take our puppy. Well these little girls came up wanting to play with him & it was fine at first. All of a sudden they start hitting him & throwing trash at him so the puppy starts growling. I tell them to leave him alone because he'll bite & they didn't listen. Then i go to the concession stand as an excuse to get away. when we go back to sit down they walk up to us again & just start grabbing my daughters snacks. My daughter starts telling them to go away, not to touch her things & so on. The little girls don't care & neither does there mother who is watching them this whole time & says nothing. My daughter got mad & slapped one in the face & pulls the other ones hair ripping her bow off. They left crying & i honestly didn't even know what to say to my child so i acted like i saw nothing. I know i should have got on to her or at least told her not to hit/fight but i couldn't. their mother didn't even bother tell them anything or even get up & buy them something (she was to busy eating & talking to take care of her girls).