She won a gold medal in the 10m platform at the 1982 Commonwealth Games, having taken silver in the event in 1978.
In her title defence in 1986, she came second behind Canada's Debbie Fuller to claim her second Commonwealth silver medal.
Awarded the Australian Sports Medal in 2000, Beddoe was appointed a Member of the Order of Australia in 2001 in recognition of her "service to diving as a competitor, coach and administrator."