Thanks for the information. I'm beginning to think that it might be best to reach out to living descendants for answers.
When I attempted to get Workhouse Records, I was told that there was no record of any of these people being in the Workhouses. Perhaps I should try again and this time, forward a copy of the Birth Certificate ...
I think definitely try again. I have had a squiz at the records they hold. This time you have more information so worth another shot. Perhaps ask for reasonably narrow field of search (ie from birth of Mary Ann to just after 1901 census when it looks like they were there)
Admissions 1895-1902
Births 1895-1902
Vaccination records 1895-1902
Under surname Hall and Fisher, Christian names Harriet, Mary Ann, Alice
And, yes, send copy of birth reg plus maybe copy of 1901 census entry
Nothing to lose by trying again!
Cocksie