Thanks again for the great information. We had her 4-year old check-up yesterday...her pediatrician said that while her accomplishments are in no way typical, it's probably too soon to tell how "gifted" she is and whether or not the progress will continue. He said it was my decision whether or not to have her tested, either through the school system or through a private psychologist. Thank you for the advice about documenting and recording her milestones...I always think I'll remember things, but time goes by and it's easy to forget.
Again, a thousand thank-yous for the wonderful advice and support!