Not found in 1861 or 1871 censuses: abroad?

In the 1881 census there is a family that has to be her as she is widowed and had a niece called Editha Nutt staying with her, Nutt being her sister’s married name:

Name Relation Condition Sex Age Birth Year Occupation  Disability  Where Born

RABBETTS, Louisa Head Widow F 42 1839   London, Middlesex
RABBETTS, Reginald Son Single M 22 1859 Gentleman  Dovercourt, Essex
RABBETTS, Louisa Daughter Single F 18 1863   Dovercourt, Essex
RABBETTS, Atherton H Son Single M 17 1864 Gentleman  Aldeburgh, Suffolk
NUTT, Editha Niece Single F 19 1862   Aldeburgh, Suffolk
WARD, Florence Servant Single F 26 1855 Domestic Ser Cook  Aldeburgh, Suffolk
WARD, Walter Servant Single M 25 1856 Domestic Ser Groom  Aldeburgh, Suffolk
WARD, William Visitor Single M 24 1857 Domestic Ser Butler  Aldeburgh, Suffolk

RG number: RG11 Piece: 1891 Folio: 73 Page: 8    

Registration District: Blything Sub District: Westleton EnumerationDistrict:
Ecclesiastical Parish:

Civil Parish: Dunwich Municipal Borough:
Address: Cliff House, Dunwich
County: Suffolk

The noticeable thing about all this is that Louisa’s birth date is different to that in the family records.
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I cannot find her death on FreeBMD up to c.1935 when she would have been 105.

Surname First name(s) District Vol Page
Marriages Mar 1857
Rabb*tts Hugh S.Geo Hanover Sq 1a 289   
Shrimpton Louisa Catherine St Geo Hanover Sq 1a 289