In late 2013, Thornton made her Irish television debut, featuring in the fourth series of the popular RTÉ Television drama Love/Hate, playing the part of Kellie in a single episode appearance. In 2015, Thornton got her biggest role to date, starring as Corrina Mallon in the four part RTÉ drama Clean Break. The series, directed by Gillies MacKinnon and Damien O’Donnell, told the story of Frank Mallon, Corrina's father and a car dealer. Struggling to make ends meet, Frank kidnaps the family of his local bank manager and consequently finds himself involved with some notorious local Criminals. A second series of the show has yet to be announced by RTÉ.
In October 2016, Thornton featured in the music video for Don't Mind Me by Irish alternative rock band Walking on Cars.
