Jane Carpenter dau. of William and Mary born 13 September 1827 married James Hayward 27 October 1851
You have her death 1855, but the Jane Hayward who died 1855 was 32 years old and buried at Witney St Mary 27 April her address being Burwell Farm. This is 4 years older than your Jane so I 'd question that.
Did Jane and James emigrate the same as Thomas, although I haven't checked it yet.