I located the grave site of M.J. Welty (Mary Jane Riley Welty) in the cemetery at Ryan, Oklahoma this past weekend. Also buried near her were Ruth Welty and Riley Welty and his wife. This cemetery is a few miles south of Ryan on Hwy 81 on Cemetery Rd. (FM 2070).
M. J. Welty's correct birth and death dates on Find-a-Grave should be June,1835 (birth) and December, 1919 (death).