Fiona (Curtain Call)

From Tardis Wiki, the free Doctor Who reference

Fiona was Agatha Ellis's best friend when they were young and lived in Hove.

Fiona was born with a hole in her heart. She and Agatha were bullied at school. They became friends and played Nancy Drew together. When they were both ten, Fiona's family moved away from Hove. (PROSE: Curtain Call)