DD has some friends that she's started to identify with through school, music and gigs. It's like she's finding more of an identity which is great.Just recently some of those friends have had 'gatherings' at their houses, and because they live far out(15/20 miles away) have said they can all sleep over. We don't know these children or their families. We have said no, she can go to the gathering but we will pick her up at midnight. She has gone off like a rocket, she hates us, we are so unfair, why are we her parents, everyone else is staying(girls are lying to their parents btw) etc lots of door slamming. She is our eldest so this is all very new.Help!