What I might add: If she has a sharp mind, she will have moments in her life where this will bring her in trouble with other, less bright people. Tell her that only the dimmest minds are sure of their opinion, and explain Dunning-Kruger to her. Tell her that people's opinions are made subconsciously, and that the mind will only put a veneer of reason on top. She should be aware of that, accept her doubts, and watch her own decision process. This took myself a while to learn, and I wished I had understood this earlier.
And tell her stories from your past. Funny or sad, they will give her a fuller picture of you.