Can you rule out the Susan Martin who died 1913 Willesden Middlesex born 1827 in case she reverted to Martin for some reason.
Is 1861 the last sighting of her?
Yes. I can't find her in 1871. I have searched for the youngest child, Sarah Caroline born 1859 but she died in 1862. The next youngest was Emily but I can't find her at all. And then Alfred Noah born 1855. I have found him in 1871 in Ramsgate, Kent as an apprentice baker. He had a few months in Poplar Workhouse in 1868.
The census references for Susan Temple [Martin] in 1851 and 1861 are:-
Class: HO107; Piece: 1554; Folio: 483; Page: 42; GSU roll: 174786
Class: Rg 9; Piece: 307; Folio: 95; Page: 56; GSU roll: 542611
I hadn't thought that she might have reverted to her maiden name.