The Whalebone Theatre by Joanna Quinn

Cristabel Seagrave has always wanted her life to be a story, but there are no girls in the books in her dusty family library. For an unwanted orphan who grows into an unmarriageable young woman, there is no place at all for her in a traditional English manor. But from the day that a whale washes up on the beach at the Chilcombe estate in Dorset, and twelve-year-old Cristabel plants her flag and claims it as her own, she is determined to do things differently.