It's just the tone of what she said quite frightened me and it was very clear she wasn't happy about the prospect of DD being home educated. She doesn't need to be happy about it. It isn't her daughter. She just has to do her job. Assuming she isn't part of the LA home ed department, your decision to home educate is unrelated to her job.
Under what circumstances can they force a home ed child to go to school again?
Here's the process. Once your daughter has been withdrawn from school, the LA may contact you with an informal request for information about how you are home educating her. They don't have to do that, but most LAs do. There's no legal requirement to comply with this request, but home ed parents who are clued up about the legal process strongly advise you to provide something at this point. If you ignore them altogether then they may put the wheels in motion to take you to court and try to send your daughter to school, so it's best to avoid that risk.
It's up to you to choose how to supply the information. Many LAs will offer a home visit; however, from a legal point of view it's much safer to decline the offer and keep all communication in writing instead. (I'd say its also easier for you to safeguard your daughter's mental health that way. You can keep her safe from unpredicatable officials who might make her anxiety worse by criticising or threatening to send her to school. If they do make such threats, better that it should be in writing to you, so she doesn't even have to know about it!)
You can send in a report describing her home education. There are plenty of helpful and experienced HE parents in forums who will be glad to help you explain what you are doing. If the LA has questions or concerns after receiving this report, they should write to you giving you an opportunity to address their concerns. You have plenty of latitude in deciding how to educate your child, and the education doesn't have to be perfect, only adequate, so it's likely they will be satisfied.
Having corresponded with you, if they think your daughter's education is unsatisfactory, they will send a formal legal notice (Notice to Satisfy) warning you that they intend to issue a School Attendance Order. They must give you at least 15 days to respond and satisfy them that you are actually educating her appropriately.
Once this time has expired, if they are still not satisfied with the education, they can issue a School Attendance Order naming a specific school and directing you to register your daughter there. You are allowed input into which school is named, but of course if all other schools are full then they will name the only one with vacancies.
You can refuse to comply with the SAO. Sometimes LAs will ignore you after this, if they know that you probably would win the court case so it would be a waste of their money. However, the LA can prosecute you for noncompliance. You then present evidence to a judge, who will probably find in your favour. If the judge finds against you, you will be fined, but your child STILL doesn't have to go to school! Instead of, or after, prosecuting you for noncompliance with the SAO, the LA may apply to the court for an Education Supervision Order. If the courts agree to the ESO, then the LA instead of the parent has responsibility for decisions regarding your child's education, and they can register her at school despite your objections.
At that stage, failing to ensure her regular attendance at school would leave you open to truancy prosecution.
So you see it is really quite an involved process, and not a quick one for the LA to push through. At every stage you have opportunities to provide the LA (or later the court) with information to convince them that the education is adequate after all, or to alter your educational methods in order to satisfy them. It isn't an easy thing for the LA to force a home educated child to school, UNLESS either
- the parents ignore the LA altogether, provide no information, and don't turn up to court, or
- the parents are intimidated by the process and give in and send their child to school. Unfortunately this happens rather often because people don't realise they can fight it.
I hope that doesn't sound scary. My aim was to reassure you that there are many chances to stave off a return to school. In fact, it rarely happens that a child is sent back to school over the parents' objections, unless one of the two conditions above is met.