I've had to call the police on her. She's trashed a whole wall of plasterboard and still wasn't calming down. All I said was "you can't go out, you're grounded",in a calm voice.
When the police got here, they witnessed her punching and kicking the walls.
They've logged it as a DV incident.
They started off by giving me the choice of whether to have her charged for criminal damage, and I was in a quandary as I didn't want to be the cause of it affecting her College.
Then she started smirking at the police officers, and they went outside and had a chat, and they took the decision out of my hands.
She was in a onesie with cords, so the female officer asked her to get changed, as she can't wear cords in the cell. DD refused.she was warned that she would have to remove it at the station and wear a jumpsuit they provide. She still refused.
They took her away in handcuffs. 
They came back to take a statement. And told me that when she changed out of her onesie, they could see she's been self harming again.
DD told them she did it yesterday, and apparently DD said she 'needs the release', but that she hadn't done it for months beforehand.
They said that she was still laughing and smirking though.
I feel like a cunt now.
They wouldn't let me go with her as I'm the victim. So DD will be waiting for an 'appropriate adult'. She will be in a cold cell on her own.
Her bloody charity counselling sessions are due yo end next week apparently too. Just 6 20 min sessions. Fucking useless.
And as she's almost 16, the police fear she will be too old for children's MH services, but too young for adult MH teams.
She was lifted at 2.30pm. I've heard nothing since around 4.30, when I had to email a picture of the damage to DD's wall.
If I've not heard anything by 8pm, I'm going to ring them.
What do I do to get DD the support she needs? What do I do to protect the rest of the household and the house from her violent rages?