Robyn,,
Thank you for your interest in this.
Sarah was b c 1835 in Plymouth Devon which is where her parents married.
Gullett has been transcribed in may different ways GULLEN/GULLEY/GULLET/GUILLET etc etc.
Her brother Thomas migrated in 1854, Henry Gullett and his family in 1852
One of Henry and Lucinda Gullet's nephews, Sydney Alfred George Gullett, named his son Sydney WOLTAN Gullett in 1896. Woltan has been used subsequently
I will purchase Lucinda's NSW death certificate and see what information it may add.
regards
Robyn