Hattie's credits include Ivan And The Dogs, The Night Watch, Going Dark, and Bluebeard. Ivan and the Dogs (Soho Theatre and ATC) was nominated in the Olivier Awards for Outstanding Achievement in Theatre; won the Tinniswood Award in 2010, and has been performed to further acclaim internationally. Further productions include Weighting with the partially disabled circus/theatre company Extraordinary Bodies (national tour 2015/16) and The Night Watch, her adaptation of Sarah Water’s novel (Manchester Royal Exchange) was listed as one of the top theatre plays of the year by the Observer for 2016. Going Dark was co-written and created with Sound&Fury (Young Vic and Science Museum/UK Tour), and her controversial Bluebeard was directed by Lee Lyford and created by their own company Gallivant, (Soho theatre/UK tour).

Further credits include Moominland Midwinter with The Egg Theatre and Horse and Bamboo 2013, and The Nutcracker for Theatre Royal Bath 2009 both directed by Lee Lyford.  Her work as a librettist includes Picard in Space with Will Gregory (Goldfrapp) directed by Jude Kelly, for the Electronica Festival at the Southbank 2012.  She has written extensively for BBC Radio 4 notably: The Diaries of Samuel Pepys nominated Best Radio Drama 2012, The Aeneid (nominated Best Radio Adaptation - BBC Audio awards 2013) and How to Survive the Roman Empire: The letters of Pliny 2016.