Looks like she is here on the 1901 census
Stephen W Dadd Head M 37 Hornsey, London
Louisa L Dadd Wife F 34 Woolwich, Kent
Stephen W Dadd Son M 12 Forest Hill, Kent
Frank L Dadd Son M 9 Forest Hill, Kent
Hilda L M Dadd Daughter F 8 Forest Hill, Kent
Grace E Dadd Daughter F 6 Forest Hill, Kent
Reginald J Dadd Son M 4 Forest Hill, Kent
Constance B Dadd Daughter F 3 Forest Hill, Kent
Sarah A Kane Mother-In-Law F 60 Norwich, Norfolk
Florence M Kane Sister-In-Law F 19 Plumstead, Kent
Emily L Dadd Sister F 22 Holloway, London