@BluntSheep - according to Charlie Taylor, the author of Divas and Doorslammers, the teenage brain is actually rewiring during adolescence - real change is taking place - and this can explain why teenagers lose certain abilities - impulse control, temper control, self control, the ability to see they aren't always the centre of the Universe, sense of proportion etc.
He describes this as akin to a form of temporary brain damage - but the key word there is temporary. He says that, once the changes have all happened, and the brain has settled down again, most, if not all of these abilities will return.
I saw this most markedly in ds3 - like your dd, he was a sweet child, with a lovely nature, but adolescence turned him into a taciturn grump, with a hair trigger temper - we had some MAJOR blow ups from him during the teenage years.
But he came out of it - all of a sudden, within the space of a week, he did his homework without being reminded, tidied his room, and gave me an unsolicited hug - I nearly fainted! He's now in his late 20s, and whilst he remained fairly taciturn, he is much more sociable now, and you can have an enjoyable conversation with him, his impulse and temper control are much, much better, and he is a joy to have around.
When we were going through the worst of it, I moaned to my mum on the phone, and she told me I'd been lucky with the older two boys, so I deserved ds3's behaviour - thanks a lot, Mum!
Grit your teeth - this too shall pass.