Hellena was born in Hammersmith, West London, and grew up 35 miles southwest of London, close to the towns of Ascot and Windsor. As a teenager, Hellena was a member of the Surrey Youth Theatre and National Youth Theatre of Great Britain.

Hellena trained at London Academy of Music and Dramatic Art- LAMDA.

Her film work includes; Greta in Whit Stillman's Barcelona for Castlerock, The Sweetest Thing , The Hunt and the recently completed Cockpit. She has just finished filming the adaptation of the children's novel, Ways to Live Forever.

Hellena also works as a voiceover artist spanning every aspect of the media including, television announcements, film trailers, radio, commercials for television/internet/radio, a sat-nav/GPS system, voice matching, looping, narration, spoken ring tones, anime, cartoons and video games. Recent video games include the title role in "Bayonetta" for SEGA and the female lead in "Saboteur" for Electronic Arts/Pandemic Studios.