That is interesting Shiftkitty regarding your niece, I have had a lot of experience working with autistic children, my own son and in a number of programs where I have been involved. Sometimes the autistic child will do things that totally amazes you. My son, for instance, has the ability to memorize geographic locations like a photo. When we went to Anaheim to visit Disneyland, we took a bus from the train station down Harbor Blvd. On our return trip up Harbor, he told us every landmark before we got to it, like he'd say, "park", and and then we'd pass a city park, then he'd say Carl's Jr, then the next establishment we'd pass was indeed a Carl's Jr. He did this the entire trip, and we were all so amazed at his ability to memorize our route, and every establishment and landmark! This ability way exceeds any "normal" persons ability by leaps and bounds. Many autistic children do display a very superior intellegence in one certain area like this. I have heard from recent research that autistic children may have been born with "too many" brain cells! As a result, they can become advanced in one specific area, but the can't assimilate mundane algorithms as we do in school, like math or language.
Goplacidly, I hope that I did not come on too strong when I responded to your post. Whenever I hear about a childhood delay in language, my own experiences with my son immediatly come to the fore - front. My son did not speak until he was 6, and the language delay caused us much concern and alarm. It is just so important for parents to get the best help and treatment for their children as soon as they can, as early intervention really works! I wish the best for you and your family.