While Ferguson was caught red-handed, Lacey said he doubts it will irreperably harm her in the long run.
"She's been a wonderful mother and she's also been a great source of delight to us royal watchers," he said. "I think she's going to be back."
In her 1996 memoir, Ferguson wrote about what she perceived as her shortcomings as a royal.
"Even at my dizzy height of popularity, I knew the clock would strike 12 and I'd be seen for what I was: unworthy, unattractive, unaccomplished. And finally, logically, undone," she wrote.
The same year her memoir was released, as she was divorcing Prince Andrew, British tabloids were abuzz with the news that she owed more than $4 million to British bankers Coutts and Co. and that the royal family, specifically Queen Elizabeth II, was fed up with Ferguson's free-spending ways and refused to pay her bills.