Is she the same as ID No 1586 ??
Her Baptism is not found on the Glamorgan Baptism Index (1569-1837) CD
Baptisms, Wiveliscombe Parish, Somerset: (PM-619)
BASSETT, Catherine 06 Oct 1772, D/O Thomas & Jane
BASSETT, Richard 30 Dec 1774, S/O Thomas & Jane
Oct 1790 Will of Mary Leyson: mentions a Dairy in Prisk (Welsh St Donats) “to be enjoyed by Elizabeth & Catherine Bassett sisters of the above named Jane Bassett, & their Heirs forever. (PM-639)
Jane Bassett Will: written 25 July 1814, proved 1817. (PM-362)
Jane Bassett of the parish of Welsh St Donats in the county of Glamorgan, widow. I give unto my three sons Richard Bassett, John Bassett and Robert Bassett one acre of land in the parish of Welsh St Donats to be divided equally being holden of the manor of Talyvan. I give unto my son Charles Bassett of St Mary Hill the sum of 2 pounds; to my daughter Jane Bassett Spinster 10 pounds. I give to Mary the wife of Lewis David of Welsh St Donats 10 pounds and all my household furniture (except one bed which I give to Mary David her mother). I give to Catherine the wife of Morgan John of Welsh St Donats the sum of 5 pounds. I give to Elizabeth the wife of William Williams of Treos in the parish of Langan 2 pounds. Executors: sons: Richard Bassett, John Bassett and Robert Bassett. The Mark of Jane Bassett 25 March 1817. Witnesses: Wm Howell of Cowbridge, Ann Mathew of Ystradowen and Richard Thomas, Prisk. Richard Bassett the lawful son and one of the Executors swears that the personal estate does not amount to more than 10 pounds. (PM-362)
1851 Glamorgan Census for Catharine John born in Carmarth* (Ancestry.com): Not found.