Nutmeg, what jumped out of me from your original post was this -- you said she was mature, with a wicked sense of humor, and a great vocabulary. One thing I have learned from hanging out on this board is, you've seen one gifted kid, you've seen one gifted kid. Frequently, younger sibs present as less "typically" gifted. You may not think she seems gifted, but I rather think she might be. Mature, sense of humor, good vocabulary... If it were me, I would want to test.