Snowgirl,
I do not think introverted and shy are synonyms. You can be shy yet want to be with others. You can be bold and like to spend lots of time alone.
I spend a lot of time with DD working on tortoise skills, slow and steady because she is naturally, (again like me) fast. Likes to move fast, likes it when the answers come fast. She hates teh tortoise lessons (we use piano practice for this). She is high energy and it is great for her metabolism. But she will do better in life if she can learn tortoise skills. I tell her if she can use her fast brain and be slow and steady when things are very difficult, she can do anything.
I do not think that is any different than trying to work with a shy child and teaching them to be bolder. So they can get anything, have any options.
Because I tell DD that I do not know what she will want to be, but I give her the skills to have options so she can have a wide range of options.
Ren