I'm not sure if this is helpful, but she is shown in the Woodlands East Cemetery transcript done by Hydro in the 1950s as follows:
Allan Grant - d. 1943
Amanda A. Adams - d. 1858 (I think this should be b. 1858, d. 1932 - see below)
Sarah Mina Empey Adams - d. 1942
The three graves are listed together in the transcript, which shows only dates of death.
It appears that the stone was moved to St. Lawrence Valley Union Cemetery (or a new one was made) when the area was flooded for the Seaway. See: http://cornwallroots.info/cms/cornwall/tombstones/Tombstones...
I am not related to this family. I just have a few reference documents and have family in the area.