If I'm not mistaken, the cemetery is the Stenabaugh Cemetery. The graves are as old as the 1840s up through recent times:
http://www.interment.net/data/canada/ontario/wentworth/ancast/stenabaugh/stenabaugh.htm
I hope that LE carefully checked the gravesite of a baby girl who died on December 27, 1967. Surely, the cemetery will get a close inspection.
The closest I came to finding the baby girl you mention, was one with the initials A and D, born December 28 as opposed to Dec 27.
Is that the right one and if so, what do you think is the connection to A.G ?