Yes, it is interesting how some kids have such extreme intellectual needs from such an early age.
I've found the more you provide, the faster they go, the more they want and the happier they are.
You are ahead of me in that I didn't have any idea how different the girls were at an early age. I thought all kids were like them.
I think I really started to realize something was up was when second DD was in 4yo preschool. While first DD was just as miserable, she was quiet. DD5 is more the "I'm mad as h@$ll and I'm not gonna take it anymore!" type.