After my meandering, indecisive, hand-wringing thread, I thought I'd update you all to say that I deregistered DD2 today!
So we are officially Home Educating her. Today she's been with Daddy to the Barber's shop to watch him have a hair cut, bought some lovely flowers and a card for her teacher, watched the baby coots from the bridge over the village pond, visited Nanny and Grandad and generally enjoyed being stress-free.
After school she took the flowers and card to her teacher and wished her a lovely trip tomorrow (she was due to go on a school trip tomorrow but decided that it wasn't worth having to go to school for another day just to get a trip to a country park).
I'm hopeful that she'll start to relax now. Thank you all for listening to my rumblings - it really helps to share it with People Who Know.