I have come across several refernces to the Gullett family in Goverment gazettes particularly for Victoria via worldvitalrecords.com
In a SA gazette 3rd Aug 1854 there is mail for Mrs Sarah Gullet in the published names of unclaimed letters. The unclaimed letters list published on 9 Sept 1855 has Sarah Gullett. If only YOU could read those! Maybe she (if it is your Sarah) had left for Victoria by 1854.
It would be nice to be able tp get copies of those unclaimed letters. They might tell us lots.
I feel that Sarah may well have been at sea if she was with William Willie as his occupation was mariner. They lived in Williamstown in Melbourne in 1888 when William died.
Perhaps William Willie was George Weltern??? who changed his name. Possible but unlikely, William gives his parents names as Joseph Willie and Sarah Shace. Samea names on his death certificate. Hard to find in UK records as it is pre civil registraion for both of them.
I have Google searched for Weltern and as a name it is very rare; certanly the ELizabeth Lucinda Weltern registration is the only one in SA!!! (My family history library had the old micrfiche so I checked on the original hadwritten version which was very clearly WELTERN Elizabeth Lucinda.)
Also checked the 1851 Devon census Gulletts without success. (other Gulletts present but not this family.
Definitely no marriage for Sarah George or William in the microfiche (handwritten and difficult to read) Wish I could find Sarah Willie's death registraion and order her certificate!!!!!
Perhaps I will look at QLD where a couple of Gullett's settled in the ear;ly 1900's.
I have just been contacted by another Gullett descendant.
Sarah Willie nee Gullett died on board the "Runic" in 1901 and was buried at sea off the Cape of Good Hope. It is assumed she was going home to England either for good or on a holiday.