Rosie spent her university years writing pantomimes based on old classics. The 2003 production of The Wizard of Odd: Search for the Ruby Strippers enjoyed critical acclaim. This was followed a year later with a successful showing of Harry Potter: The Musical (complete with moving opening number, 'In My Cupboard I Will Stay').
Rosie has written features for Cosmopolitan, The Lady, The Sunday People, Reveal and Best Magazine. Her first rom-com, How to Get a (Love) Life, was published in 2014. Corvus, an imprint of Atlantic Books, published How To Stuff Up Christmas in 2015 and How To Find Your (First) Husband in 2016.