The broadcaster later said one body had been found and five others on board were missing.
Search efforts are continuing and the wreckage of the helicopter has not been recovered.
"Debris has been found in Italy's zone of control and intervention" in the Ionian Sea, the source told AFP.
"My lovely daughter has been in a military accident and passed away", her mother Tanya added on her Facebook page.
Aircraft from Canada, Italy and Turkey are carrying out search operations looking for the CH-148 Cyclone helicopter with additional support from Greece and the U.S., North Atlantic Treaty Organisation said in a short statement.
Vance said approximately 240 CAF members who left Halifax in January, to take part in NATO's Operation Reassurance, had just completed their 100th day of the mission.
"Our church family has lost a wonderful woman", wrote the church in an announcement to its congregation.
The Cyclone routinely flies with a crew of four: two pilots, a tactical operator and a sensor operator.
The who has warned of the possibility of re infection COVID 19
More than 56,000 people have died in the United States, representing more than a quarter of all deaths worldwide. The total number of cases in mainland China now stands at 82,836, and deaths at 4,633.
North Atlantic Treaty Organisation search-and-rescue teams are reportedly searching worldwide waters off Greece's Kefalonia island.
It appears a tragic accident has occurred in Greece involving a Canadian military helicopter.
Greek TV says the helicopter, which is believed to have been one of the Royal Canadian Air Force's new Cyclones, went missing in the sea between Greece and Italy while operating off a Canadian frigate.
According to later information, the lost helicopter was a CH-148 Cyclone, not a Sikorsky CH-124 Sea King.
We are heartbroken to share that Abbigail Cowbrough, who was on board the HMCS Frederiction passed away during a helicopter flight training exercise accident.
Greek Prime Minister, Kyriakos Mitsotakis, also shared his condolences.
After the crash, Canada's military has made a decision to temporarily ground its Cyclone helicopters, the CBC reported.