I don't have an IQ test result that includes processing speed, but my DD also is a fast processor. In K, we got papers home with incredibly elaborate, beautiful drawings. She is now in a gifted school and we don't see this anymore.
She also stopped letting me read aloud at age 5, because she could read faster in her head. (I hate to have people read aloud, too!)
writing ability... dd seems fairly typical in what she is writing - except that she completes the assignments very quickly. She finished the required sentence - so she wrote a second, she finished the second and started a third while the other kids were still half way through the first.
It also sounds like she has good fine motor skills? A lot of writing at that age is about motor skills.
