She is known for her debut role as Frances in the BBC Three and Hulu miniseries Conversations with Friends (2022),[1][2] and she was named in Variety's "10 actors to watch" in 2023.
She applied to Trinity College Dublin's drama school The Lir Academy, but was invited to take a year-long foundation course in Acting and Theatre first.
She received the news that she had been cast in Conversations with Friends the morning after graduating from drama school.
Oliver made her feature film debut in Saltburn, written and directed by Emerald Fennell.
[9] In November 2024, it was announced that she had been cast as Isabella Linton in Fennell’s next film, an adaptation of Wuthering Heights.