Bentall's first professional acting job was an episode of Holby City, which she filmed in 2006 while still at Richmond College. Her other television credits include You Can Choose Your Friends, Doctors, Oliver Twist and New Tricks. She played Mary Bennet in the 2008 mini-series Lost in Austen, a performance described as "by far the most interesting interpretation of the sanctimonious middle Bennet daughter of Pride and Prejudice yet". In 2009 she joined the regular cast of Lark Rise to Candleford, playing Minnie.