Hi Sue,
Thankyou so very very much for your great clue. Yes, we found our Charlotte at last. She was born as Charlotte Eleanor Kewney, christened 10 June, 1810, in Lezayre, IOM, to John Kewney and Margaret Fayle. She is Nelson's sister.
Thanks again. :-) You made my day.
Kindest regards. We have looked for our Charlotte for soooo long.