Nancy Ann Heston Knight and her husband Jonathan Knight have a stone and memorial at Westland Cemetery, Centerville, Washington, Pennsylvania #42402267, but according to this letter she is buried in Poniac.
Letter from William Knight, East Bethlehem, Wash Co, PA 9th mo 2nd 1863:
I write to thee now to perform the painful duty of informing you that my mother Ann Knight is deceased. She died at brother Zephaniahs in Pontiac Michigan on the 23rd of last month. She had reached to end of her 73 years a few days before. She was buried in Pontiac on the 25th ult, her three sons in Michigan being present.