Her published works of fiction include the short stories "Walter" (Polygon), "Deadly Sin" (Polygon and Argyle Press), "Write Your Name Small" (Herald), and "Do You do Teas?" (Edinburgh Review).
Her novel The Witches of Pollok was published by Capercaillie Books on 6 October 2010. Her novel 'The Miami Disclosure' was published by SNB Publishing on 9 January 2021.
She has also written non-fiction including: On Being an Actor (Chapman), China Diary (Herald) and On having Irish Roots (Argyle Press).
Her works as a playwright include: Waiting on One (winner of Thames Television award), published by Fairplay Press, 2007; The White Bird Passes (adapted from the novel by Jessie Kesson). Published by Fairplay Press, 2007 and The Female of The Species Published by Fairplay Press, 2007.
Her plays have been produced by companies such as Theatre Workshop, Perth and Borderline.
She has written for television series: High Road (STV), River City (BBC) and The Bill (Thames Television/ITV).
Downie's works for radio include Side Sea View (BBC Radio 4) and Race (series for BBC Radio Scotland), among others.