Re: Why didn't the crew start calling Seven 'Annika'?
Unlike adults she went into a maturation chamber which induced a radical change to her physical form that Picard and others didn't experience. Her skull alone certainly isn't bone looking at the one Doc was holding. Also, a large chunk of her brain is making space for that chunk of hardware that makes up a significant part of her brain. Annika may have been put into that maturation chamber, but Seven of Nine is who came out.
We are quicksilver, a fleeting shadow, a distant sound... our home has no boundaries beyond which we cannot pass. We live in music, in a flash of color... we live on the wind and in the sparkle of a star! Endora, Bewitched