The gravestone has 1829 but the obit ("Mrs. Hendershot was past 73 years of age") and the 1900 census indicate she was born in 1828.

Also see Find A Grave Memorial# 68712546, Henry Co., MO, a memorial marker which may be for the same person, or a descendant, perhaps.

Wife of Paul Hendershot. (he died in Henry Co., MO in 1880)

"April 4, 1901 of Plurasy, Mrs. Phebe Hendershot, at the home of her son C.W. Hendershot near Fidelity, with whom she has made a home for a year. Mrs. Hendershot was the mother of Mrs. J.P. Earhart and Mrs. A.W. Dixon (Dickson) of this place, who with their families were called there last week. Mrs. Hendershot was past 73 years of age. Besides her sons and two daughters who were left to mourn her death, she leaves many warm friends that will remember her as a devoted christian. Mrs. Hendershot united with the christian church at the age of 15, and for 58 years has been a true follower of Christ. Owing to stormy weather funeral services were postponed to some future time, and the remains were buried in the Comet Cemetery northeast of Granada."

The Fairview Enterprise: "An old lady, Mrs. Hendershot, near Comet was buried Friday. W.G. Schlarb went down with the hearse and the day was terrible stormy and muddy."

6/1/1870 census. Hendershot household.
Osage Twp., Miller Co., MO
Paul, 45, farmer, b.OH
Phebe, 43, b.OH
Martha, 19, b.VA
Aaron, 18, b.VA
Marinda, 16, b.VA
Elizabeth, 14, b.VA
Susan, 12, b.VA
Charles, 9, b.VA
Mary J., 6, b.IN
Eunice, 4, b.IN

6/1/1880 census. Hendershot household.
Windsor Twp., Henry Co., MO
Febie, female, 59 or 52, farmer, b.OH, dad b.PA, mom b.OH.
Marindie?, 24, dau, b.VA, parents b.OH.
Lizzie, 23, dau, b.VA, parents b.OH.
Susan, 21, dau, b.VA, parents b.OH.
Charles, 19, son, b.VA, parents b.OH.
Jane, 16, dau, b.IN, parents b.OH.
Unis, 14, dau, b.IN, parents b.OH.

6/1/1900 census.
Powhattan Twp., Brown Co., KS
(living with her son Charles, his wife & eight children)
Hendershot, Phebe, mother, b.Feb 1828, 72, Wd, b.OH, parents b.OH.