She began her career in modeling and gained prominence through her roles in the film The Face of an Angel (2014) and the ITV period drama Mr Selfridge (2014–2015).
In 2012, Bennett made both her film and television debuts in Trapped as Emily and the first series of the BBC One drama Prisoners' Wives as Saskia.
In 2014, she joined the cast of ITV period drama Mr Selfridge for its second and third series as the seamstress Jessie Pertree[9] and played Elizabeth Pryce in Michael Winterbottom's psychological thriller The Face of an Angel.
Bennett starred in the 2018 Syfy television film sequels Lake Placid: Legacy directed by Darrell Roodt and Leprechaun Returns.
That same year, it was announced Bennett would star as Mary Tudor, later Queen of France, in the latter half of the Starz historical miniseries The Spanish Princess, which aired in 2020.