It's never too late to apply!
If you have an ECHP you are entitled to name a school. It's a very clear process, you name the school near the end of the process once you have received the draft plan.
Suggest you read this:
https://www.nhs.uk/NHSEngland/AboutNHSs ... carers.pdfThen search up and contact your local authority parent partnership or Independent advice service (IAS) - they are very knowledgeable and supportive.
Then, armed with all your information, ring the LA to start the process off.
I would imagine, in case your daughter is lower down the ranks and wouldn't get a place in the first round,
but this is just my guess and you should confirm that with either your LA or Nonsuch, that if your daughter qualified, and you have an EHCP plan in place before March 1st, and have named Nonsuch first on your CAF, that they would have to admit her.
If she is high up enough to qualify anyway, then an EHCP in place will ensure she receives the support she needs.
Good luck - and ring your LA's IAS or parent partnership as soon as you can. They will know what to do.