My child's birthday is coming and she wants to invite a girl that she thinks is her friend. This girl is nasty and continuously picks on my child. I don't want that girl or her mother in my house but my daughter really wants her to come. I have tried talking to the mum but the apple doesn't fall far from the tree. My daughter is very trusting and wants to be everyone's friend but I want her to have a great day and not be worried the nasty little girl is going to get angry. Should I invite her or not? If no how can I explain to my daughter?