Thank You, all of you, for sorting me out. I feel pretty confident that
1843 Mary Jane Dalley on GRO births
1861 Mary Jane Dalley age 6 on census, dau of John and Ann
1871 Mary Jane Dalley age 17 on census as domestic servant
1874 Rose Jane H Dalley on GRO births note the H
1876 Rose Jane Dalley baptised at St Andrew, Northampton, mother Mary, no father
1877 William John S Dalley on GRO births
1880 Mary Jane and Thomas Harrison married
1881 Rose Jane Dally dau, and William J Dalley son, of Thos, and Mary Harrison on census
1891 Rose J Harrison age 17 working as a cook in Bolton
1896 Rose Jane Harrison married Dexter Dalley.
Dalley to Harrison to Dalley via Dally and Dalby caused me some confusion, but I'm now sorted, Thanks
Coelmar.