Thank you, ladies. Today's been rough, although I have had several conversations with some really lovely support workers both at DD1's school and in Child Services, as well as a couple of close friends.
DD1 was still very angry and defiant this evening, I'm past the point where I can deal with her right now, as is DH, we're both mentally exhausted. She's been confined to quarters and we'll talk with her tomorrow, when things have calmed down.
Thanks for the info re counselling, Sassy, I'll look into that. DD1's school also have an in-house counsellor that she's going to be encouraged to see, I just really want her to have someone that she can talk to freely without worrying that I will somehow find out what she's said if that's not what she wants.
EDBD - ironically, the argument this morning was because she realised she wasn't getting her phone back to take to school after her bad behaviour this weekend! All electronics banned indefinitely now. She can make do with books and crafts - imagine that, a life with no smartphone - how did we ever manage when we were children?! 
Anyway, tomorrow is another day (paraphrasing one of my favourite films there, do you recognise it?!) and I'm determined it's going to be a good one as my baby is turning one and is hurtling out of babydom towards toddlerhood!
Here is a photo of his present, it's a garage with various vehicles that all sing songs and make noise, plus the garage itself is incredibly loud! I don't think I thought that one through very well...!!! 😂
Have a good night's sleep, both of you. Hope you manage without the sleeping pills, Sassy. Thinking of you.
Catch you tomorrow!