She was gone from England by about 1844. She married John Hixon (Hickson, Hixson). I do not know where she married him. If in England or the US. I had heard New Orleans, but have never found anything to confirm that.
I am unable to find her marriage or birth. Any immigration records, etc.
I had hoped that this would be the key to it, but I am thinking not. I have a Mary Sandy who was christened in 1817 in England. I have found a Mary Sandy or two in the the 1841 England census that could be her, but again, nothing can confirm that.