It comes a day after the body of her 76-year-old husband was discovered in Trephina Gorge.
The pair went missing had been missing in the remote outback since Friday, with temperatures soaring to 40 degrees Celsius.
N-T police sergeant Phil Emmett has described the incident as "tragic".
"I'd just like to convey my condolences. Such a sad end to what was obviously a lifetime of endeavour, and of planning to come and visit Australia. What a tragic end."
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Rocks and Gum Tree in the Trephina Gorge in Northern Territory, Australia Source: iStockphoto