De Oliveira was born in
Toronto, Ontario, to a family of Brazilian origin. She began a modeling career at the age of 14, but always wanted to be an actress. She studied drama and dance at
Rosedale Heights School of the Arts, and once she went to college, she finally acquired an acting agent. The film premiered at the
Whistler Film Festival on December 1, 2018. In August 2018, De Oliveira was cast as Becky DeMuth in the
Netflix horror film
In the Tall Grass, directed by
Vincenzo Natali and based on the novella by
Stephen King and
Joe Hill. The film was released on October 4, 2019. While in Toronto to film
In the Tall Grass,
Atom Egoyan asked to meet with De Oliveira, leading to her being cast as the starring role of Veronica in the film
Guest of Honour. The film premiered at the
Venice Film Festival on September 3, 2019. De Oliveira was announced to be in another adaptation of Joe Hill's work in February 2019, as the antagonist role of Dodge in the Netflix series
Locke & Key, based on the
graphic novels of the same name. While filming the show, she also reunited with Vincenzo Natali, who directed the last two episodes of the first season. The first season was released on Netflix on February 7, 2020. De Oliveira was very excited to play a villain role for the first time, and the character of Dodge greatly appealed to her because of her unapologetic nature to be evil, which is something rarely seen in roles given to female actors. De Oliveira was inspired by
Angelina Jolie's performance as the title character in
Maleficent for her portrayal of Dodge. ==Personal life==