DD 4 was at a party today and she came to me at it crying saying her friend X pushed her into some netting. She calmed down after 5 mins, I saw x hovering around us. DD wanted to go back and play so I brought her over to the kids including x and reminded them all no pushing, X just laughed and ran off. I was going to say to X's mother who is also my friend about what happened but she left the party before I had a chance. Just noticed DD has a red mark and early bruising on her cheek from the push hours ago in the party. I'm just feeling very annoyed as it was obviously a big push and X's mother has no idea it happened. I'm tempted to text X's mother to tell her about what happened and the injury but don't know if there's any point