In 2006 she returned to the London musical stage playing Christmas Eve in 'Avenue Q' and in 2015 was part of the huge ensemble cast in the big screen 'Everest', as ill-fated mountaineer Yasuko Namba.
But just as she was about to sit her mock GCSE General Certificate of Secondary Education exams, her father was posted back to Tokyo, and Mori was then given a choice: move back to Japan with her family or stay on in London on her own.
Her subsequent television appearances include as Julia Sawalha's studious friend in 'Absolutely Fabulous', the hospital receptionist in ' Casualty' and in 2010 as Yoko Ono in 'Lennon Naked'.