[citation needed] Her grandfather, Ronald Bingo Mavor, was The Scotsman's theatre critic in the early 1960s before he became the director of the Scottish Arts Council.

[5][4] She studied at Collège Eugène Fromentin in La Rochelle and at Mary Erskine School in Edinburgh,[6] In 2008, she joined the National Youth Theatre.

[1] Her first acting experience was in school productions of Shakespeare's The Tempest as Miranda[6] and in The Merchant of Venice, directed by John C. Allan, prior to a stint in the National Youth Theatre.

[14] In the same year, she appeared as Liz in Sunshine on Leith, an adaptation of the stage musical based on the lyrics of The Proclaimers, first screened at TIFF 2013.

[15] In 2015, she starred in Joann Sfar's French-Belgian mystery film The Lady in the Car with Glasses and a Gun alongside Benjamin Biolay and Italian actor Elio Germano.

[18] Mavor's next television role was in Channel 4 historical miniseries New Worlds, where she played Jamie Dornan's love interest in a 17th-century story set in England.

The same year she appeared with John Malkovich in the BBC One miniseries The ABC Murders, based on the mystery novel by Agatha Christie; alongside David Kross in the biographical film The Keeper, about the life of German football player Bert Trautmann; and with Vincent Cassel and Olga Kurylenko in another French-language production, L'Empereur de Paris, about early 18th-century French criminalist Eugène François Vidocq, the man who is considered the first private detective.