Up to the age of 18 Eilish was trained by Jill Tindale at Quay Theatre Arts in Weymouth. She then furthered her training at Rambert School of Ballet and Contemporary Dance. She was also a Senior Associate with The Royal Ballet School and attended the Juilliard Summer Dance Intensive Course.
Her Theatre Credits include: Corps de Ballet ensemble in The Phantom of the Opera (UK and Ireland Tour) Tantomile, Assistant Dance Captain, cover Victoria/White Cat, cover Jemima in CATS (International Tour). Artist in To Gillie, With Love (Gillian Lynne Theatre). Dancer in War and Peace, Welsh National Opera (Royal Opera House). Tantomile, Assistant Dance Captain, cover Rumpleteazer in CATS (RCCL). Dancer for Headliners Theatre Company (P&O Cruises) Dancer for the BBC Proms (Royal Albert Hall).