Hi Stephen,
This is the only one I can see in Brighton....
1851 - HO107; Piece: 1645; Folio: 101; Page: 49
Civil Parish: Brighthelmstone
Town: Brighton
County/Island: Sussex
3 Mighell Street
Lettie White, Head, 77, Seamstress, born London St Clements
1841 - HO107; Piece 1121; Book: 3
Civil Parish: Brighthelmstone
Hundred: Brighthelmstone
County/Island: Sussex
Kemp or Kinch Town
Charlotte Wheeler, 36, Ind, nor born in county
Lettice White, 60, FS, not born in county
6 other servants in the household
Not sure if this will help or not - it does say on the 1851 that she is unmarried (but she could be a widow).
Happy hunting

Karen