She was also there at that address in 1881, with husband William. Both born Ireland.
1881 Piece 3717 Folio 13 Page 20
Her full address, according to FindMyPast would be 2, Hills Place, Wavertree, West Derby, Lancashire, England, so maybe?
In 1891, a widow, and only 5 yrs older than she was in 1881!
1891 Piece 3003 Folio 46 Page 23
Thanks very much for your help! I think this confirms this isn't the Ann I was after! Similarities are there though, my Ann's husband was also William, and she would've been widowed by 1891 too. Can't see any matches, last information I have on her is when she's in the Brownlow Hill Workhouse in late 1882, nothing after that. Her husband William dies in November 1887, and she wasn't the informant on his death certificate (I am entirely certain of this record, as everything matches), so perhaps a death between 1882 and 1887 is possible, but still nothing.
For the 1891 census, there was a possibility, in the West Derby workhouse:
Ann Finn Pauper widow 69 gen domestic servant Ireland (will look for the exact details soon, e.g. folio, etc, sorting through paper records at the moment!) This was the one that led me to this record, with the workhouse death being something I thought made this more plausible than anything else.
Her other census entries:
1851: on Ancestry as Ann TIM
Piece 2178
Folio 44
Page number 32
1861:on Ancestry as Ann FLEM
Piece 2659
Folio 40
Page number 24
1871:
Piece 3767
Folio 24
Page number 1
1881:
Piece 3605
Folio 33
Page number 25
I can't find anything at all in 1901, but no death records between 1891 and 1901 either. There is an Ann Finn aged 72 dying in Lancashire in 1894, but registration district is incorrect.