Quote Originally Posted by chopendoz
Thank you for your input. It seems that I will have to get a copy of the marriage Certificate in oder to make progress.
That would seem to be a wise move

I may search the passenger lists of those ships BEFORE her birth in 1818
Passenger lists for those emigrating to America may best be found at the point where the emigrants debarked. Passenger lists were not required to be kept until much later in the 19th century.

Also, she must have some record of her existence in the UK prior to her marriage in 1839
Not necessarily, unless she had done something which required her details to be recorded. You won't find her in a census. The Tithe Redemption Returns only name heads of household. She wouldn't have been in the military. Your best bet is if she needed to go 'on the parish' - i.e. if she was poor and needed to receive assistance.

Geoffers