I'm not convinced that Thomas and Martha were Jane's parents, Ruth.
I found a Martha Savage in 1861, widow 64 born Old Weston, in the household of John Savage 35 widower born Glatton, Hunts.
I checked Glatton 1841 and found
Thomas Savage 40 ag lab
Martha Savage 40
Elizabeth 13, Sarah 8. All born in Hunts
I'd already checked Alconbury Weston and drawn a blank, for any Savages.
There is a Savage family in Sawtry All Saints in 1861, John 49 and Sarah 45 where Sarah was born in Alconbury, John in Sawtry. Another family in Sawtry was headed by William Savage 25 born Alconbury with his brother John 20 b Sawtry
I've found this family in Sawtry in 1841; John Savage 25 ag lab; Sarah Savage 20; William Savage 5; Charles Savage 3, John Savage 11mths, all born in Hunts. So a family of Savages moved from Alconbury to Sawtry sometime prior to mid 1840.
But no sign of a Jane anywhere!
What was Jane's married name, and where was she married?
If she married William Slow in Alconbury Weston on 28 May 1855 her father was Charles Savage, which makes a mockery of everything I've written above!
regards
David