I think this may be the Hannah Williams who left a will. The 1891 census has the surname transcribed as William but earlier censuses show the surname as Williams. Note the address.
The 1901 census appears to have Susannah Williams, still single, with her sister Mary and brother in law John Hay.
https://www.familysearch.org/ark:/61903/1:1:QLMJ-ZMM
https://www.familysearch.org/ark:/61903/1:1:X9NG-WKN
William
William
You are absolutely correct. This is the Susannah Williams and Hannah Williams that are on the probate record.
Unfortunately, when the death certificate turned up it wasn't for "my" Hannah Williams. It was however, the widow of one James Williams.
I still haven't identified the correct death certificate for my Hannah Williams.
I know she was living with her daughter and son-in-law (transcribed s Bradtham" rather then Bradshaw) in 1891 in Canning Town.
She may possibly be on the Westminster Catholic census of 1893. There is a Hannah Williams (with no age is given as she was above 21) living at 42 Bridge Road, Grays, Essex. No occupation, a widow, from a "mixed marriage" (Hannah wasn't baptised a Catholic but she was married to a catholic and her daughters were baptised as Catholics). This Hannah Williams was rather sadly described as Bedridden and there is no one else living at number 42.
I can't find any record of her on the 1901 census so I think it's probable that died before then. So I will look for a death certificate either in the Grays/Orsett registration area or possibly Canning Town for a death between 1891 and 1901.