Ebogdanoff on Family Tree Circles

Frances Fuston Milligan born 1811, wife of John Milligan , farmer, Techumseth, Simcoe County Ontario. Found on 1861 census. John remarried in 1864 to Mary Jane Arnold. Death too early for vital records but probably buried in Mt Tagart Cemetery. Frances is my ggggm. I descend from son Thomas Milligan. Appreciate any help in finding death or burial info between 1861-1864.