I wouldn't worry about anything. She sounds like my daughter. I took my daughter to the dr about 21 months concerned because she didn't say anything. She did use sign language. Then one day about 3 months later, I heard her thru the baby monitor perfectly singing her ABC's. LOL After that, she would never be quiet and constantly asking questions.
If I were you, I would keep reading this sight and read anything and everything you can get your hands on about gifted children.
Good luck, you are going to have your hands full.
