East Sussex waiting times?

I emailed the unit that would be conducting the assessment every 6 months. I just checked I was still on the waiting list and for a current waiting time. They always answered within a couple of hours.

You might like to ask your GP about re-referring your daughter for assessment using the Right to Choose pathway (RTC), which you are entitled to use instead if you wish.

In England (only), this enables access to certain, approved, private autism assessment providers who typically have much shorter waiting lists than the NHS, but with your referral and assessment still fully funded by the NHS. 

I was on an NHS waiting list for two years before I learned about RTC and switched to it (on the recommendation of an NHS psychiatrist). My assessment and diagnosis (I chose to use Psychiatry UK) then followed around just four months later.

Some examples of RTC providers are listed here, along with some further explanation.

More information:

NAS - How to request an autism assessment