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Sarah Ferguson responded after she was captured promising to introduce an undercover newspaper reporter posing as a wealthy businessman to the Prince.
It remains to be seen if she fulfils a planned public appearance in Los Angeles later, when the Duchess is due to pick up an award for her charity work.
Her reputation appears to be tarnished after footage emerged showing her shaking hands on a $40,000 (£27,650) cash down-payment after promising the unseen reporter: "I can open any door you want."
The News of the World - which carried out the sting - alleges she then asked for the main payment to be wired to her UK bank account.
"£500,000 when you can, to me, open doors," she tells the reporter during the exchange, which was filmed on Tuesday night.
But, according to the News of the World, the prince was not aware of any such dealings.
Ferguson reportedly asked for a confidentiality agreement before agreeing to the alleged deal.
Buckingham Palace has declined to comment on the allegations.