She went back to the FC last night, didn't kick up a fuss when the police took her back.
FC insisted she get up for school, and school are keeping her under lock and key under constant supervision. Whether DD gets in the transport back to the FC tonight remains to be seen.
And she is STILL adamant that she is going out on Sunday, and probably tonight too.
DD told the police that the reason she didn't want to stay with the FC is because the FC has taken her phone away and she wants it back because it's hers and it's theft...
She also told them that she didn't want to come back to me for the same reason. I'm going to get the phone back off the FC, because as DD seems so fixated on the phone, I'm concerned that there might be something on there that she doesn't want the FC or me to see. In which case, I kind of HAVE to look on the phone to see what it is, as it might give us all some clues as to WTF is going on with DD right now.
So we are just waiting to see if DD is going to get in the taxi at the end of school.
Hopefully it will be harder for her to abscond over the weekend as she will be in a rural location and has no money for bus fares.
I NEED to find out what is driving these behaviours, nobody can help her otherwise.
I spoke to the school as she has swapped her tie with the friend who WAS on a managed move to another school, which failed, so she's back at DD's school (this is the friend that is two years younger and indulging in the same behaviours as DD.) but it's for the other school, and I was worried about the strict uniform rules at the school, but they have given her a tie.
The HLTA chatted to me, and said that they were surprised at DD's recent behaviour in school, and I explained (patiently and calmly despite me having been saying the same thing for TWELVE FUCKING YEARS) that this is the same behaviour she has been displaying at home since she was 15 fucking MONTHS old, and they were shocked that it has taken this long to spill over into school.
Maybe if the HLTA had actually LISTENED TO ME SAYING THIS at the CIN meetings last year, they could have done something to bloody help!!
Or at any number of school meetings I have had since DD started preschool!!
I have an EP report from when DD was FIVE YEARS OLD in Y1, stating exactly the issues I was having at home, with her being unable to process the fact that her actions have consequences.
That was TEN BASTARDING YEARS AGO.
They sent me on yet another parenting course, despite the fact that I'd already BEEN on three since she was born. The techniques from those parenting courses have helped me massively with the DS's, but have never had any bloody effect on DD's behaviour.
It's SO frustrating.
Social Services today have admitted that even THEY can't keep her safe.
Financially, I have until Tuesday to inform Tax Credits and Child. Benefit that DD is no longer resident with me, as it will have been three weeks at that point, and I have to do it within 28 days.
I will also have to inform Housing Benefit. So I will become subject to 'Bedroom Tax' too, as I will be in a house larger than my needs. The fact that it is an adapted property, and there are NO suitable, EMPTY correctly adapted THREE bedroom properties will not matter a jot.
So my DS's ARE going to lose out through this, as I will have less money to pay for things for them once I am subject to Bedroom Tax AND have a reduced income.
She won't be able to come back. 
Even SS have admitted that it looks likely that DD may remain in FC long term. At least when she bothers to go there. And they admit that nobody can actually keep my DD safe from herself and her self-destructive behaviours. 