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I don't know if you still need some information regarding your posting, but I'll reply just the same.
A direct line descendant of Ephraim & Hannah (Wentworth) Payson has written a booklet titled "Direct Ancestors of OLIVE KING (PAYSON) TRUE (1817-1886) of Hope Maine". His name is Edward Keene True, and to the best of my knowledge, he still lives in Searsport, Maine.
His extensive research has deduced that Ephraim Payson 4 died in Brooks, Maine, and was buried in Morey Cemetery in Hope, Maine. I don't know his sources. Hannah (Wentworth) Payson died in Hope, Maine in 1801, but he does not mention where she is buried. It's probably safe to presume she is in one of the Hope, Maine cemeteries, but may not have a stone. The other possibility is that she was returned to Stoughton, Mass where she was born.
Can't lead you to anything more, but I hope this will give you some ideas.