She was still alive whwn her husband wrote his will in 1745.

This burial in 1775 is a tad late for a birth in 1688 (when AAG reported her to have been baptised):

Record set           Buckinghamshire Burial Index
First name(s)        Elizabeth
Last name            Greenwood
Burial year          1775
Death year           -
Denomination         Anglican
County               Buckinghamshire
Country              England
Place                Haddenham
Document type        Bishop's transcripts
Page                 -
Burial date          10 May 1775
Marital status       Widow
Register type        Baptisms, marriages & burials
Register year range  1750-1836
Archive reference    D/A/T/91
Archive              Centre for Buckinghamshire Studies
__________________

No will found.