This is the only Grace I can find.
3 Ely Road Tonbridge
Ada B Pankhurst 1 Tunbridge, Kent, England Daughter Tonbridge Kent
Elizabeth Pankhurst 38 Speldhurst, Kent, England Wife Tonbridge Kent
Frederick W Pankhurst 11 Tunbridge, Kent, England Son Tonbridge Kent
Grace M Pankhurst 3 Tunbridge, Kent, England Daughter Tonbridge Kent
Henry Pankhurst 40 Tunbridge, Kent, England Head Carpenter and Joiner Tonbridge Kent
Henry J Pankhurst 12 Tunbridge, Kent, England Son Tonbridge Kent
Sophia E Pankhurst 9 Tunbridge, Kent, England Daughter Tonbridge Kent
Susan J Pankhurst 5 Tunbridge, Kent, England Daughter Tonbridge Kent
Perhaps the enumerator in 1881 just wrote Dartford for her because all the rest were Dartford???