Darlyn Wummer said she was having a garage sale with her sister in Deltona when a woman, with whom she was unacquainted, showed up and stole her wallet.
Deputies said Wummer and three other elderly people were ripped off by Sonia Gautier, who now faces 54 charges, with the potential for more.
"It's just such a horrific act, not just us who are great-grandparents trying to shop for Christmas, but anyone to be taken advantage of," she said.
Wummer said she hates that she was "so gullible and trusting."
"We took her inside to see some bedroom furniture, and she gestured toward the furniture," Wummer explained. "When she gestured, she had already scoped things out, and my wallet was laying on the dresser."
Gautier took the wallet, used the credit cards and stole all the cash, according to deputies.
Authorities said a 93-year-old man was also ripped off, when Gautier posed as a health care worker.
"She took the wallet, looked at the card and distracted him somehow," said Jim Condomitti, the victim's son.
Condomitti said his father was robbed of two credit cards and $300.
Deputies said the number of victims is likely to go up, based on what they found in Gautier's banking records.