Martin was born in Solihull to an English mother and a Scottish father[1] and grew up in Knowle with her two older brothers and younger sister.

[6] She originated the role of Miss M in the world premiere of the rock musical 27 at the Cockpit Theatre in 2016, which she also choreographed assisting Arlene Philips.

Martin made her acting television debut as Penny Radcliffe in the 2017 Sky Atlantic drama Riviera.

[8] In 2019, she joined the cast of the History Channel series Vikings for its sixth and final season as Queen Ingrid.

She also appeared in the Sky Atlantic comedy-drama I Hate Suzie Too and Julia Hoppen and the ITV series Malpractice as Camilla Woodham.