What metaphors are used in Princess in Love by Meg Cabot?

The limo is Mia's transportation to and from school and anywhere else she needs to go. She has a driver and a bodyguard that travels with everywhere in the limo. Mia also gets to spend time with Michael and Lilly because they ride to and from school with Mia. The limo serves as a symbol and metaphor for Mia's entitled life.