you misinterpret the rounding - she was nominally between 40 and 45 - most older women in 1841 tended to underestimate age (exceptions were those at the high upper end) - however most women pass childbearing age at about 43 - her last child was in 1835 hence my suggestion - she is likely buried in maughold in 1846 - Maughold was the last of the parishes to give age at death so no help unless there is an MI

Cain is quite a common name!