The inscription on this stone reads, to the best of our ability:

JUNE 27×77
THE 13 180L

We infer that the the last digit of the year is "6", but what it most clearly looks like is an upside-down "7".

At the moment the only thing we know about "Elona"'s identity is that Ann Dunbar Cahoon, whose grave is next to hers, had a "beloved niece Elenor Blizzard", according to her will. Presumably, one of Elenor's parents was either Ann's or her husband James's siblings, but since we don't know if Blizzard was her maiden or married name we can't even be sure if the relationship is through her mother or father. More research is clearly called for.