Stewart grew up in Junee. She graduated with an Honours degree in English literature from the Australian National University in 2009. She has been commissioning editor of Seizure, and a book editor at NewSouth Publishing. In 2014, she was a resident artist at the Arteles Creative Centre, Finland. Her first collection of poetry, Knocks, was published in 2016. In 2018, she was poetry editor at Giramondo Publishing.