In a nutshell my dd is 4 and has social communication/speech and language developmental delay, the Paeditrician is going down the ASD route but is not making a definite dx until a multidisciplinary team meeting after we see him next in September.
Since she turned 4 in March her expressive language is getting so much better. Today I had just changed the sheets on our bed, and dd went under them and said that she was in a Pyramid, looking for treasure, and that it was dark in the pyramid
, she then said that it was now a submarine underwater looking for fish more
, she then said that she was in her treehouse, and then back in her pyramid looking for Dora's lost toys 
Never in my wildest dreams did I expect that! She was using one thing being under the sheet) to imagine it was a multitude of things and situations, all spontaneous from her imagination