Hi Janis,
From the 1871, 1881 and 1891 (of which I am 100% certain that it is my Mary Waters), she says that she was born in Stockton around 1845.
From the 1851 census, (which I believe is the same Mary), she says she was born in Wreckington, Durham around 1845. From the 1861 census, (again, which is believe is the same Mary), she says she was born in Lamesley, Durham around 1843. It appears that Wreckington, Lamesley and Stockton are all very close to each other.
In the GRO index, I started in Sept 1837 and went year by year up until 1850 looking for all the children with Hunter as the mother's maiden name. All the siblings show up except for Elizabeth and Mary.
Joan