Here's Ellen Cavendish in 1881 and 1891......
RG11/600/106/41
Lambeth, Surrey, England
16 Cleaver St
Henry P. Jones 70 Head Labourer born London, Middlesex
Elizabeth A. Jones 60 Wife born Greenwich, Kent,
Caroline Heard 64 Widow Visitor Charwoman born London, Middlesex
Mary Dormer 62 Widow Boarder Charwoman born Southwark, Surrey
Ellen Cavendish 76 Widow Lodger Honorable born Camberwell Surrey
Joseph Beck 27 Unmarr Lodger Tram Conductor born Surrey
RG12/1344/93/14
Leyton, Essex, England
6 Chester Tce
Ellen Cavendish 86 Head widow private income born Camberwell
She doesn't show up on any other censuses as Ellen Cavendish......so I'll search for other spellings and age ranges.....
dee