thank you also Jim, I have now decided can't be a daughter of Isabella either,plus 18 is still only 1867..
Mary Ann b1847 married 1866
Jane b 1843 m 1878
Eliza b 1848 unmarried
the most likely candidate is now a brothers wife:Ann b 1855, married 1876.
thanks for helping me get my thoughts together on this!
Cee