Sorry to butt in but this varies by area.Unfortunately the NHS don’t recognise private assessments as a diagnosis for autism and ADHD. But at least they would provide her with ways she can help her son until she is able to obtain a formal diagnosis. In the meantime she needs to constantly badger her local authority don’t just sit back and hope it will all go away
Lots of parents are tired in particular here of the adhd wait. They go private and titrate with medicine then the care is transferred over, it’s called shared care. I also did this with my son.
If anyone goes this route speak to your gp first and ask if they will do this. With adhd if you go the medicine route the titration has to be done with them as a gp will only prescribe it once you’ve settled on a dose (that’s how it is here for adult and child private to shared care)
Here all the gps do this as they are quite happy for people to take the assessment and diagnosis away from the nhs as the waiting lists are like 2 years long.