In 2009 Dynevor landed her first role as Siobhan Mailey in the fifth series of Waterloo Road. She has also made appearances in several British dramas such as Monroe and The Musketeers.
She had a supporting role in both series of Prisoners' Wives as a gangster's daughter Lauren. In 2014 she appeared in the second series of The Village and from 2015–2016 she played Martha Cratchit in Dickensian.
In 2017, Dynevor joined the cast of Younger in a recurring role as Clare.
