Withnall was born in Townsville, Queensland, but attended school at Canterbury High School in Sydney.
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Shane Stone, in his introductory speech upon his election to the Port Darwin electorate in 1990, referred to Withnall as a "fearless and uncompromising advocate of self-government and statehood for the Territory".
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She was the Independent member for Nightcliff in the Northern Territory Legislative Assembly from 1974 to 1983; in the First Assembly, she and fellow independent Ron Withnall were the sole non-Country Liberal Party members.