Career
She is best known for her roles in Give Out Girls, Pramface and The Royals. She also starred in the film Reykjavik Whale Watching Massacre (RWWM) which is due to be released in the United Kingdom by E1 Entertainment She went to the drama school Drama Studio London
In May 2013 it was announced that Hennessy would be joining the cast of Sky Original sitcom Give Out Girls. In 2014 she starred in Siblings on British Broadcasting Corporation Three.
In 2015 she starred in Hoff the Record with David Hasslehoff and Plebs on ITV2.