Could possibly be the mother of Martin Sage baptised 25 Dec 1836 at Clifton St Andrew, mother Ann Sage of Hotwell Rd, servant. There is a Martin Cage age 5 at Hotwell Road in 1841 but head of household is a Jane Cade 40 (born out of county) and I haven't found him after that. Not the Martin Sage who died in Suffolk in 1849 as that one was 82.
Edit - now we have the image of that baptism available on ancestry:
https://www.ancestry.co.uk/interacti...nSearchResults
It says Martin, son of, and then baseborn has been added in; parents' names "Martin M &" crossed out, Ann Sage. So it looks likely that his father was Martin M......