Our educational psychologist who tested my DD6 recommended this book:
http://www.amazon.com/Exceptionally-Gifted-Children-Miraca-Gross/dp/0415314917I personally haven't found much literature on kids at the extreme end and haven't bought the book because it's so expensive but have been reading articles online, particulary the Davidson's database. Here is one:
http://www.davidsongifted.org/db/Articles_id_10124.aspxI'm not sure if you have had any testing done but does your DC qualify for DYS?
We also trying to gather information about homeschooingl as a potential next step in the future as this is what I was told might be in the works for our DD.
I hope you get the some good info to help!