If born 1742 she was only 14 when married?
FreeREG has Mary/Elizth 1759 as stated by Spendlove + Eliz 22 Jun 1760
(both Eliz may have been buried 16 Aug 1759 and 31 Jan 1761)
+
Burials
MARY wife of Wm Covil a Farmer 24 Jul 1804
+ WILLIAM Covil 11 Dec 1810, age 76 (1734), Widower, Farmer