Jane Farquharson b. 1829, Strachan, Aberdeen, Scotland
Where does this come from? Strachan is not in Aberdeenshire. It is in Kincardineshire, and so far no-one has quoted any even vaguely reliable source to suggest that Jane was born in Strachan.
Jane married William Emslie on 5 August 1848 and the marriage is recorded in both Chapel of Garioch and Logie Coldstone (IGI community indexed)
She was in the 1851 census (transcription) as aged 27 and born in
Strathdon, Aberdeenshire
She married William Bisset on 31 August 1854 and the marriage is recorded in Maryculter, Kincardineshire (IGI, community contributed)
She had a daughter born 31 August 1855 in Maryculter, Kincardineshire (IGI community indexed)
She was in the 1861 census (transcription) as aged 32 and born in Strathan, Aberdeenshire
There is an unconfirmed report that she died on 25 October 1861 but there is no matching death certificate
A Jane Bisset was buried on 10 October 1864 at John Knox Cemetery Aberdeen but there is no matching death certificate
She was apparently not in the 1871 census (transcription)
William Bisset is described as a widower in the 1881 census (transcription)
Have you seen the originals of all these documents? The 1855 birth certificate, in particular, will tell you Jane's age, where she was born, how long she had been in Maryculter and how many children she had had altogether.
Now, assuming that the age in the 1851 census is accurate, and she was actually aged 27, this means that she was born between 31 March 1823 and 30 March 1824. (For reasons I have explained elsewhere in these forums, birth years 'calculated' by subtracting the age on a census from the census year are more often wrong than right)
There is in the 1841 census (transcription) a household at Belnaboddach in Strathdon consisting of George Farquharson, 35; his wife Hellen, 25; two small children and ten servants including Jean Farquharson, 15. Now, adults' ages in the 1841 census were supposed to be rounded down to the nearest five years, so this Jean could have been any age from 15 to 19, which means she would have been born between 7 June 1821 and 6 June 1826.
She is almost certainly not the daughter of Hellen Farquharson, who is at most 14 years older than Jean. She could be George's daughter, but if so why would she be listed among the servants? Do you think she might be 'your' Jane?