Frost began working on series such as ''The Queen's Nose'', as well as the BBC's popular continuing dramas:
Doctors, and
Casualty. Frost wrote and consulted on multiple episodes of
Shameless. She has also written on
The White Queen,
Jamaica Inn,
The Man in the High Castle, and
The White Princess. Recently, she was co-showrunner and wrote for
The Spanish Princess with
Matthew Graham. Her film work includes the
BBC Four drama
Consuming Passion: 100 Years of Mills & Boon and the screenplay to
Zelda, a film in development by
Ron Howard. Frost was writer, showrunner and executive producer on an adapted series of
Edith Wharton's
The Age of Innocence for
Netflix, which began filming in 2025. ==Personal life==