The OCFA website includes an entry for Mary Fursman in Perth County. The "Bible Christian (cairn) " is located within Woodland Cemetery in Mitchell. I wonder if someone has access to OGS transcriptions for this entry and will share details?
There is a photo of this headstone at https://cemetery.canadagenweb.org/ON/ONPER13357/ONPER13357-21-CanadaGenWeb-Cemetery-Ontario-Perth.jpg
This is the information that I could decifer
Mary A. Fursman / Sept 2, 1861 / Aged 6 years