That can be true, but in girls it can show up in ways that aren’t spotted.
@Howthehell24 can you describe in more detail what she was like when she was younger?
you said she was a very ‘biddable’ child - what do you mean by that
what were her toddler tantrums like?
did she get upset or angry between ages 4ish to when this started?
how has her sleep and eating been?
what was she like as a younger child? What did she enjoy?
your post is pretty self centred tbh - focusing on a terrible thing that is happening to you. Which it is, and you have my sympathy.
BUT
this behaviour isn’t normal.
it’s your job as a parent to trace what’s driving it
get curious, start reading and researching
irs great CAHMS etc are involved (I am close to a family with similar struggles and they’ve got very little back from those routes). But you have to be pro active and assertive with all those services
the family I know the DD has just being diagnosed as ASD via private assessment
Looking back there WERE signs there much younger but not the obvious (ie male) ones and it never showed up at school
parents denied or themselves for too long there was something going on
and the two parents have very different styles.
one too authoritarian and ‘you’ll learn to behave (and be normal)’
one too permissive and people
pleasing - also wanted to be ‘best friends’ and is crushed by the hurtful things she says.
neither were meeting her needs
the contradiction between the two made everything worse
you have to be the sea wall
on which their waves break.
as said up thread you have to manage your reactions to her anger and not give it power.
clear firm consistent boundaries.
the following you around with shouting and violence is a dis functional way of seeking connection with you
She’s certainly feeling scared and ashamed which will be feeding her anger.
You need to look deeper