There is a possible marriage for Alice Nuttall and John Spencer in 1850.
1841 - difficult as you have no real pointers- she gives various districts of Bury as her birthplace I think but if you thought it was her,the marriage certificate would help perhaps.
1871
Elizabeth born Yorkshire - Elizabeth Spencer is the married daughter of John and Ann Nuttall and Alice is a boarder so I don't think that is her. Intreseting though about the names.
The other Elizabeth is also a married daughter of the Nabb family- her husband is with her so again I doubt that it is her.
As for John Silker- I agree it must be him but we will never know perhaps why he is listed as that name!