there are some 25 approx christian families in Peel , German + Patrick in 1851 census - the marriage was in Patrick in 1855 - can you not determine her age from 1861 census ? - there are at least 4 Ann christians born in Patrick that might fit (of the 40 or so within age group 18-30 at marriage.

All Manx christians probably have some link to the famous Milntown family but it may well be impossible to determine