The film, adapted from Jojo Moyes bestselling novel, tells the story a young Englishwoman who is hired as the caretaker for an affluent Londoner paralysed in a tragic accident.
In autumn 2018 Marshall appeared opposite Charlotte Riley and Ben Chaplin in the BBC drama, Press written by Mike Bartlett and directed by Tom Vaughan.
Marshall's storyline involved her character Helen Pidge's surprise appearance at the hospital announcing her shock pregnancy to unsuspecting married nurse Lofty, played by Lee Mead.
Marshall has also starred in a number of television commercials for brands such as House of Fraser, Head and Shoulders, Vodafone, Raffaelo, Fruit of the Loom, Persil, Experian, Żywiec Brewery, Coop (Switzerland), Allianz and George clothing.
In June 2016 she spoke at the Next Century Foundation's Middle Eastern Migration Conference in Westminster on ways of countering human trafficking and modern slavery.
[23][24] In September 2016, Marshall was interviewed on the Arab News Network's The English Hour about her stance on the refugee crisis, immigration and combating prejudice and racism following the Brexit result.