Girls Out Late — Jacqueline Wilson

Ellie finally meets a boy. The right boy. And she wants to spend all her time with him. Her curfew is way too early, but if
her stepmother doesn't tell, her father will never know she's been out late. It's not like anything bad is going to happen, and her father doesn't need to know what she does every minute of every day. As long as she brings her friends along, everything should be all right. Too bad the best laid plans often go wrong!