There is some helpful information on the Coram Children's Legal Centre website which explains the appeals process and provides advice on how to appeal the decision. They also have a helpline for some further advice about this and possible representation. http://www.childrenslegalcentre.com/index.php?page=school_admissions_and_appeals
I hope this helps.
Sorry for the delay in responding to your post, I have been on leave.
Did you have any success finding some help with your appeal?
Sorry to hear that you have not been able to find any help.
Try the ACE Telephone Adviceline on 0300 0115 142 Monday- Wednesday 10am-1pm term time only.
Keep trying Coram Children's Legal Centre because they will be able to provide you with some advice about this.
If you could let me know which part of the country you live in, I will look for local services for you.
It might be worth trying DIAL North West Kent https://www.scope.org.uk/support/services-directory/DIAL-North-West-Kent-disability-information-advice to see if they can assist you with this or point you in the direction of a local service that can help you with the letter writing.
There is also Thurrock Young Carers which could be a valuable contact for your daughter for some extra support http://www.youngcarerscentre.org.uk/thurrock-8-18s
I hope this is helpful and that the information you are reading from Coram and ACE are useful. Please keep in touch and let us know how the appeal goes.