- A member of the singing group, The Seekers, she is the main voice heard in the theme song for Georgy Girl (1966). The record was a hit and peaked at #1 in the US pop charts.
- She took her mother's maiden name as her stage surname.
- She was married for 25 years to British pianist, composer and former member of the The John Barry Seven pop group, Ronald Edgeworth, until his untimely death from Motor Neurone Disease.
- Graham Simpson's 2003 biography of her ("Colours of My Life") is named after the song that she and David Reilly wrote when she was with The Seekers in the mid-1960s.
- She was the main singer heard when The Seekers performed their hit song, "The Carnival is Over," during the Sydney 2000 Paralympic Games Closing Ceremony.
- Sister-in-law of Patrick Edgeworth.
- Along with her fellow The Seekers band members Athol Guy, Keith Potger and Bruce Woodley., she was individually named as an Officer of the Order of Australia in the Queen's Birthday Honours of June 2014.
- In May 1990 she was involved in a head-on collision on a highway outside of Melbourne, Australia. The driver of the other car was killed and she was seriously injured, spending months in a hospital and in rehab.
- She died a week after Tom Springfield who wrote many of The Seekers' most successful songs, including "Georgy Girl", "I'll Never Find Another You", "A World of Our Own", "The Carnival Is Over" and "Walk With Me".
- While developing the screenplay for The Switchblade Sisterhood (2023), writer/director Davo Hardy had approached Judith to play a supporting role, as a grandmother to Breanna and Lacey. When news suddenly broke that Judith had passed away, the part was removed and the story reworked, out of respect for the late performer.
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