okay, just a warning.
If you want to get an EHCP it will be much easier if she is still in school, but signed off with anxiety.
An EHCP can take up to a year to sort out, and you need lots of evidence.
LAs are very unlikely to fund your child for anything once you deregister as it will be deemed Elective Home Education.
There's an adoption blog called Family Of Five where children with an EHCP who subsequently deregistered were still not given any funding.
I know people whose children have Statements (old style EHCPs) who get absolutely nil funding (this in London)
So please please do not assume you will get money for funding, unless your LA is remarkably forward thinking.
I DO KNOW people whose children have left school with severe anxiety, but they were still registered at school, and received home tuition (small amount) or funding for online tuition, but crucially they were still the responsibility of the LA as they were not deregistered.
This in no way detracts from the the emotional freedom to be gained from deregistering, but I did not wish you to have false illusions.
I stand to be corrected, if anyone has good news!!!