In case you dont have Harrietts Birth Reg and Mothers maiden name;
AYTO, HARRIOT, ASHER*****
GRO Reference: 1837 S Quarter in GRANTHAM UNION Volume 14 Page 284
Thomas AYTO, Bachelor, married Hannah ASHER, Spinster, 20 May 1835, St Guthlac, Little Ponton, Lincolnshire
Witnesses, JOHN /ANN Ayto
So looks like Harriet is with her possible Grandfather in 1841 Census i Little Ponton;
John Ayto, 50
Ann Ayto, 20
Mary Ayto, 15
George Ayto, 5
Harriet Ayto, 3***
There is also a possible Marriage for JOHN Ayto to Mary SKIRRET 16 May 1808 same Church.
Likely Parents of Thomas and Grandparents of Harriet