She won a gold medal in diving at the 2004 Summer Olympics and in 2006 became the 22nd athlete to be named in the Australian Institute of Sport Awards' "Best of the Best".

Born in Melbourne, Newbury's first international success was at the 1998 World Aquatics Championships in Perth, Australia, where she won a bronze medal in the 3m springboard event.

Four years later, she won a gold medal in the 10m platform event at the 2004 Athens Summer Olympic Games ahead of Lao Lishi of China and fellow Australian Loudy Tourky.

[6] In 2009 Newbery told Australian magazine Woman's Day that she was admitting herself to a psychiatric hospital for severe depression.

[6] In January 2023, Newbery pleaded guilty to stealing groceries in July 2022 and for unlicensed driving in December 2022.