1.You should request an early review of the EHCP (on their website IPSEA has a model letter you can use) in order to try to improve the EHCP, via appeal if necessary. At the moment, it isn’t fit for purpose and it sounds like DD needs more support than it currently provides. If DD requires specialist tuition it can be in the EHCP. Personally, I wouldn’t fund tuition yourself. I would save your money and appeal when you next have the right of appeal, seeking independent reports.
2.Assessments could have been part of the EHCNA without sitting on the normal waiting lists. And, ongoing provision included in the EHCP without sitting on the normal waiting lists. An early review and appealing if necessary getting independent reports can resolve this too. Alternatively, you could request a reassessment of needs (IPSEA also has a model letter for this), but you may still end up appealing in order to get the necessary provision.
3.Melatonin is usually the first medication DC try to aid sleep. It is one of the safer medications. It is naturally occurring, some people, especially ND individuals, don’t produce enough naturally, so topping it up helps. I would consider requesting it.
4.If you google OT equipment, aids and adaptations and your local authority you should be able to find who to contact for a home OT assessment to look at making the house safer and better meet DD’s needs.
5.DD shouldn’t be able to get out of a crelling harness. They are specifically designed so DC can’t. Relook at that and if DD can still get out of it look for a specialist car seat clinic.
6.CAB can help complete DLA forms - although how good they are varies. There may also be a local charity. The Cerebra guide can be helpful, too. Evidence depends on what you have. Depending on what is in them the EHCP, paeds letters, referral letters. Do you have anything official from when DD has run away or if you have had social care assessments? Subject access requests to school, hospital and GP may help.