Isabella Rose Merson Blake-Thomas was born in London, England, and currently lives in Hermosa Beach, California, with her mother Elisabeth and her dog, Chai.[3] Her first role was at the age of five, when she was selected to present the CBeebies television program Green Balloon Club. This ran for one series between 2008 and 2009. Later in 2009, she had a minor role in the biographical television film Enid, playing a girl who attends a tea party.

In 2010, she was cast in an adaptation of the Just Williamseries of books, playing Violet-Elizabeth Bott.[4] Isabella had another minor role as Izzie, in the 2011 film Johnny English Reborn. Her first lead role was in the 2011 little known, independent film Little Glory as Julie, alongside Cameron Bright.[5]

In December 2012, she played the part of Annabelle Crumb in the BBC Christmas adaptation of the David Williams book Mr Stink. At the age of 13, she booked a guest star role in the Nickelodeon show Game Shakers.

Over the years, she has booked over 32 roles in TV shows and movies, including the computer-animated fantasy film 2012 film Rise of the Guardians, the comedy-drama series Shameless, the Doctor Who episode “The Bells of Saint John“, the comedy series Married, the medical soap opera Doctors and the detective drama series Midsomer Murders.[1]

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