BABIES BULLYING BABIES?

So back story I had a playdate with my daughter and another little girl and my friends daughter the entire time continuously pulled my daughter down threw things at her pinched her and bit her I love the little girl but my daughter left with bruises and marks is it worth taking her back or what would you mommy's do in this situation?The mother did get onto her daughter every time so no shame towards her mother I just don't know if I can do another play date.