A Windsor, Ont., woman has pleaded guilty to defrauding the federal government of more than $150,000.

The 78-year-old woman had been the subject of a "lengthy" two-year investigation by the Windsor detachment of the RCMP, according to Sgt. Peter Koersveldt.

"With any fraud case, the volume of documentary evidence and the analysis of this evidence takes a significant amount of time," he said.

Koersveldt said the case presented "unique aspects" because the woman's husband died in the United States.

"Some of the evidence that we needed to gather and collect was from outside of Canada," he said. "So we were required to work alongside our policing partners in the United States."

Police say the investigation revealed the woman had been fraudulently collecting Old Age Security and Canada Pension Plan payments for approximately 14 years.

"While this is not a fraud in the millions of dollars, it's still significant in that it is damaging to our social support network," said  Koersveldt. 

The woman, whose name police have not released, was charged with three counts of fraud over $5,000 and three counts of uttering forged documents. All but one of those charges were dropped when the woman pleaded guilty to one count of fraud, for which she received a 12-month conditional sentence and 12 months of probation.

She must also pay $151,310 in restitution to the Receiver General of Canada.