Parenting Tip..from a child?

I've posted before where I am wondering, "Who's the parent here?" Sometimes, it's hard to decipher...the other day the babe had a play date over.  A lovely little girl that just has such a sweet nature. She came over to me after a couple hours play and said, "D is being mean to me."

My reply: "Oh?"  And by the way, D is always mean to her friends when they are over here for a play date.  She gets mad about something and just is not able to redirect herself.