Yn wreiddiol o Gaerffili, astudiodd Jemima yng Nghanolfan Berfformio Cymru a Long Beach Prifysgol Talaith California, gan raddio gyda gradd Anrhydedd Dosbarth Cyntaf mewn Perfformio. Mae credydau theatr yn cynnwys; Hansel and Gretel (BlackRAT Productions), Basil & the Ice Witch: A New Adventure in Tickledom (Tickledom Productions), Jack & The Beanstalk, Cinderella, Aladdin (RCT Theatres), Cadoc and the Drowned Bovs, Elvis: The Rhondda Years (Contemporancient Theatre) Lego Shows Live! Bahrain (ATW Events) the Stereophonic Musical R&D Word Gets Around, The Invisible Man (BlackRAT Productions), The Curious Case of Aberlliw, The First Three Drops (Taking Flight Theatre), a Heliwr Pili Pala (Theatr na nÓg).