Hayley graduated from the Royal Welsh College of Music and Drama, where she was recipient of the Paul Kimpton Prize for Innovation. Hayley is an associate artist of Sherman Theatre Cymru.

Theatre credits include: Unbelievable (West End); Romeo and Julie (National Theatre); The Boy with Two Hearts (Wales Millenium Centre / National Theatre); Iphigenia in Splott (Lyric Hammersmith / Sherman Cymru / Edinburgh / National Theatre / 59E59 New York); Hansel and Gretel, Tales of The Brothers Grimm, A Christmas Carol, Alice in Wonderland (Sherman Cymru); Blood Harmony (Thick Skin); Macbeth, Hamlet, Road (Leeds Playhouse); Gin Craze (Royal & Derngate Theatre / China Plate in partnership with English Touring Theatre); Oliver Twist (Leeds Playhouse / Ramps on the Moon / UK tour); As You Like It (Queens Theatre Hornchurch / National Theatre); A Christmas Carol (Hull Truck); Double Vision (Wales Millenium Centre); Romeo and Juliet (West Yorkshire Playhouse); Wonderman (Gagglebabble, National Theatre Of Wales / Wales Millennium Centre); Made in Dagenham (Queens Theatre Hornchurch / New Wolsey Theatre, Ipswich); The Tale of Mr Tumble (Manchester International Festival); Little Sure Shot (Bath Theatre Royal / West Yorkshire Playhouse / tour); Caucasian Chalk Circle, Britians Best Recruiting Officer (Unicorn Theatre); But First This, All My Sons, The Strange Case of Dr Jekyll And Mr Hyde, Treasure Island (Watermill Theatre); A Taste of Honey (Hull Truck & Derby Theatre); Wanted! Robin Hood, Arabian Nights, All The Way Home (Manchester Library Theatre); As You Like It (Transport); Cooking with Elvis (Derby Theatre); Fantastic Mr Fox (Singapore Repertory Theatre); Heidi, The French Detective And The Blue Dog, Around The World In Eighty Days, The Nutcracker, Animal Farm (Theatre Royal, Bath); Mongrel Island, The Boy Who Fell Into A Book (Soho Theatre); Little Voice, Peter Pan, My Mother Said I Never Should (The Dukes, Lancaster).