She spent her early years in Rochester Terrace, a heritage-listed townhouse in St Vincent Place, Albert Park.

[3] In 2010 DeJonge played the lead role in Maziar Lahooti's short film Good Pretender, for which she won Best Actress in the 24th Western Australian Screen Awards[3] in 2010.

[8] In 2015, DeJonge appeared in the Australian ABC's television drama series Hiding, on which she played one of the lead roles as Tara Swift / Shaneen Quigg.

[6] M. Night Shyamalan directed the film, which had its premiere on 31 August 2015, and was released on 11 September 2015 by Universal Pictures.

[11] She drew praise from critics, who applauded her ability to match co-star Austin Butler's charisma.