Wow well done, its a long road to diagnosis and it sounds like you have done it alone. I too have a 4 yo daughter (also very clever with an excellent vocab), we had a break through last week and a Dr gave as good as a diagnosis although its not yet official. My husband was also a non-beleiver but thats because he has it too but never been diagnosed. I was doing it all alone but it all turned around when we had the almost- diagnosis and now hes on my side. We watched the movie Temple Grandin the other night and he recognised so much of himself in her that he has decided to check himself out with a Dr too. Often one of the parents will have Aspergers too as it has a strong genetic link. The only problem I have now is to convince my Mother in law who is exactly the same lol!
So great that you have the diagnosis, I know our little break though made me feel so much better, I know Im not going mad and imagining it all now! At least you can start to change things for the better now and help her with any difficulties she may have.
Good luck
I have found a great link for family who wont accept diagnosis, its for Aspergers though. Made me feel better if nothing else, as you know the non-beleiving problem is actually quite common.
Especially for Grandparents of children with Aspergers