Who is Cee Cee from Haunted: A Tale of the Mediator and what is their importance?

Cee Cee is one of Susannah's closest friends in Carmel. She is very intelligent and somewhat of a nerd. When Susannah needs help researching people and things, she puts Cee Cee on the Internet. Susannah also lets the reader know that Cee Cee has a crush on their friend Adam.