She is probably the Gaynor Evans that was buried on 21 Feb 1795. The fact that she is buried under her own surname is not unusual. Her grave states that she died on 21 Mar 1795, age 42, a month after her burial date.
Sources
Llanrug Parish Records, Marriages, 1771
Llanrug Parish Records, Burials, 1795
St Michaels Churchyard Gravestones Memorial Inscriptions, Gwynedd Family History Society, 2012, N034
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