Elizabeth was born about 1855. [1]
There are two deaths for Elizabeth Long's in the Amersham area with about the right birth date. One born 1850, died 1914: https://www.findmypast.co.uk/transcript?id=BMD%2FD%2F1914%2F4%2FAZ%2F000620%2F020
The other born 1851, died 1928: https://www.findmypast.co.uk/transcript?id=BMD%2FD%2F1928%2F3%2FAZ%2F000483%2F045. There is also a probate record related to this death.
Census records can be found for both persons, and they consistently each have either 1850 or 1851 birth dates.
The 1921 census includes only one Elizabeth Long, born 1852, but record not accessed to date. However it seems probable that the 1928 death is therefore for this profile.
There is no obvious birth record locally, although there is a baptism in Bovingdon in 1851 (just over the Hertfordshire border from Chesham) for an Elizabeth Munn: https://www.findmypast.co.uk/transcript?id=GBPRS%2FB%2F71680966%2F1
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