[3] When she was eleven, she won a national story contest and was awarded the title of "Junior Journalist.

[5] De Coster made her debut in 2000 with her first book, called Under Each Other, a collection of dark tales about the disintegration of an unusual family.

In 2002,[citation needed] at the age of 26, De Coster published her debut novel, Vrije Val (Free Fall).

Arne Quinze invited De Coster to capture the alienation which his monumental work Rock Strangers (Oostende) exude as well as the intimacy of My Secret Garden (Kunsthal Rotterdam) in contemporary stories and distinctive film footage.

De Coster has designed the cover of her sixth novel "Wij en ik" herself.