Hi Jamjar, Borneo,
Having spent a few hours researching this family over a few occasions to help...the family lived in Llanguich or Llangiwg (same place) from at least the 1841 to 1849 when Jenkin wed.
If Hannah died within this time I would think she would be buried within the parish where her family lived, not the Swansea area. If unable to locate would then look to the surrounding areas for a possible burial. The Hundred of Llangafelach is a wide area, with many hamlets/parishes.
LLANGAFELACH , or LLANGYFELACH , a village , a parish , a sub - district , and a hundred in Glamorgan.
I believe from what we have learned, that they lived in Llangiwg, this booklet from the link Borneo posted, may help assist with further info for all family and possibly extended members.
Llangiwg, St.Ciwg; plus Pontardawe PRs
Just my thoughts....
Cas