Hi, @Sweetchillijam! I'm sorry everything is so difficult for you and your daughter right now, that must be really tough.
Not to be presumptuous or in any way judgemental, I was just wondering if your daughter had been assessed for any mental health conditions? Obviously some of it may be typical teen angst, but a lot of mental health issues show up in middle adolescence (e.g. anxiety, depression etc, sometimes even autism). I'll be honest and say I had a horribly messy room that was about a similar level to your description, but I had very bad depression that meant I just couldn't clean it up or be productive.
If she's not having any mental health issues, do you know anything about her life, could she be having issues at school / with her peer group? Bullying can cause lashing out like this sometimes, as a bit of maintaining control. I think the main factor is probably if she's behaving at school in this way - if she's not, it suggests she's getting worn down by something in her academic or personal life and you're a safe person to throw all of that energy at (rather than expulsion from school, bad reputation etc).
Has she had any big events happen recently that could cause this? Moving house, divorce, big breakup, death etc. It may also just be that she's in a very difficult stage of her adolescence right now, and will leave at 16 only to come back a little while later when she realises you're not the Antichrist (unless of course, you are!
)
I'm really sorry you're having such a hard time though. If you ever want to PM me, then we can have a proper chat about it. x