Carrie is the best friend of Hale Garner. She is mentioned in The Crown during a date between Hale and Princess Eadlyn. She is presumably from Belcourt.
According to Hale, "other friends, our parents... it's like everyone has always wanted us to be together." However, he has never had any romantic feelings for her, and expressed that she's "like a sister" to him.
During the Selection , Hale was questioned by royal guards after Burke Renn was eliminated. They thought he was writing to a girlfriend, rather than Carrie only being his friend. Carrie had to talk to the guards over the phone and affirm that they'd never been together. Carrie found this amusing.