They then emptied the victim's account. Age Concern Canterbury chief executive Simon Templeton said it was absolutely disgusting that people like Greig saw the elderly as a "soft-target".
"She has caused a huge amount of harm to these people," he said.
"What [she has] done has a huge impact on their lives. It is not a victimless crime."
His message to Greig: "Don't come out [of jail] and do it again, get the help you need inside."
Greig's latest victims have been reimbursed by their banks. But others have been left out
of pocket, Templeton said.
"Unfortunately, when you provide your personal details that voids the banks' responsibility and then the victim is left out of pocket," he said.
Police were alerted by family members and launched operations to catch Greig and her co-offenders.
Greig has been reported as saying she spent the money on drugs.