from my IoM burials data base I can see some 3 Jane Christians buried post 1861 that by age at death were born c. 1799 - one you found in Malew, one in Onchan(reported address Castletown Rd Braddan) and one in Maughold (address College St Ramsey)
not sure if any really match - in Peel in 1861 their blind lodger was Margt Gawne als Cottier but I've not worked out any possible relationship

I'm only going on custom at that period in that a widow at her age would often move to be looked after by a child usually a daughter - remember there were no pensions so she relied on savings or any work she could do.