Well, thankfully she hasn't crashed my car or stayed out all night yet, but her behaviour towards the rest of the family has been remarkably teen-like for the last few weeks.
She has become obsessed with a certain series of books and has stayed in her room reading them for hours a day. When not reading them she is re-enacting the stories using her toys. I only know this because I have startled her a couple of times by going into her room. I am not allowed to observe the game or join in, and she won't tell me what she's doing because "it's private". Neither am I allowed to read these books to her as she wants to do it herself.
More generally she is being scowly and grumpy until teased or chided out of it. It is nothing serious and a good tickle usually sorts it out, but she seems to have a default mode of 'mumble and grunt'. The other day I accused her of treating the house like a hotel and thought- I knew those words would come out of my mouth at some stage, but not quite this early!
I've asked if anything is bothering her or making her unhappy and she says not at all, and i can still get a cuddle out of her if I ask nicely! I wondered if it is common for girls of this age to go through such phases? I know there is nothing 'wrong' but I feel a little put out at the lack of contact she seems to want with the rest of the family.