Hi
Hope this helps
Same family at same address in 1851
Sarah Pears hh- widow age 62 Occ Baker born Yarwell, Northants.
Robert Johnson -son in law-age 32 Occ. Wheelwright born Torrington, Norfolk
Hannah Johnson -daughter age 32 born Spalding
William grandson age 9
Mary granddaughter age 7
Sarah granddaughter age 6
Thomas grandson age 3
Susannah granddaughter age 6 months
children all born Spalding
So that possibly gives you Hannah's maiden surname + 2 more counties to extend your search.
Good hunting
lemur41