She has also appeared in the BBC Two sitcom-horror series Psychoville in 2009 and was a contestant on the reality shows Strictly Come Dancing (2009), Celebrity Big Brother (2012) and The Masked Singer (2025).

In 2006, she played a rival to Lauren Cooper in an episode of the BBC Two comedy sketch series The Catherine Tate Show.

On 9 April 2006, the BBC announced Cassidy's departure from EastEnders with her final scenes airing in February 2007.

[5] In 2009, Cassidy was cast in a supporting role in the BBC Two comedy television series Psychoville, alongside Dawn French and Eileen Atkins.

Prior to returning to EastEnders full-time, Cassidy was the host of The Health Lottery, a competition broadcast on Channel 5.

In 2011, Cottrell was sentenced to 120 hours of unpaid work after pleading guilty to assault and criminal damage for attacking Cassidy at their home in Hertfordshire.

In October 2015, it was announced that the couple were engaged, and a few months later, on 13 February 2016, Cassidy revealed she was pregnant with her second child.

[21] In January 2019, it was announced that she would be running the London Marathon with some of her EastEnders co-stars for a dementia campaign in honour of their former castmate Barbara Windsor.