god i was sooo like that...i moved out of my mums at 15 spent part of my time at my aunts and my then boyfriends i was a little biatch. i promise you lulu it does pass im 20 now and im the one mum turns to for help or to talk to bout my bro 16 and my sis 23.
honestly she needs to realise that you wont do anything for her, if she throws a tanty TRY and ignore her (not easy i know) the one difference is i love cleanin so i cleaned my bedroom dishes etc.
it does pass and she will grow out of it.
my mum is going through it now with my brother and hes a little *****.
take care huni
rach xxxx