Milli trained on the MFA in Theatre Directing at Birkbeck, and was previously a Resident Assistant Director at Birmingham Repertory Theatre. She is a Creative Associate at the Gate Theatre.

As Director her credits include: Rats (Duffield Studio, National Theatre), EmpowerHouse (Theatre Royal Stratford East), No Cowboys Only Indians (Courtyard Theatre), Mother India and Three Wheels On The Wagon (both Birmingham Rep), Comb (The Other Place,RSC), Left Hangin’ (The Bush Theatre), We Consent (The Arts Theatre), Jerusalem (The Stephen Joseph Theatre), The Snow Queen (The Garage Theatre), Bus Station Blues (The Old Red Lion), Here Comes The Bride (The National Youth Theatre), The Vagina Monologues (Minotaur Theatre Company).

As Assistant Director her credits include: Luna Gale and Filthy Business (Hampstead Theatre), What Shadows (Birmingham Rep), The Quiet House (Birmingham Rep/The Park Theatre), The Government Inspector (Birmingham Rep/touring), The Water Engine (The Rose Theatre), How To Be A Hero (Birmingham Rep/Deptford Albany), Luminous (Birmingham Rep).