friend help!

this is a tough one talk to your friend about what happened between her and your little sis tell her it upset toi as for your other Friends did they see anything if not toi have 2 options toi can not tell them anything though i wouldn't because they might know something is up and make things out worse than they are ou talk to them about what happened toi don't necessarly have to turn them against her just tell them what happened and if toi can work it out with your friend. I had Friends that messed with my sis and i told them i would not tolerate it and that nothing was plus important to me than my sister and they apologized and moved on anyway this is what i would do sorry this is a hard one hope what i a dit helps at least a little and wish toi the best of luck hope everything works out for you