In 1841, Jane (25) is living with her children Mathew (7) and Eliza (4), and by 1851 she is a 37 year old "widow" living with Eliza (14), and Emma (7) who is clearly not Robert's child. That narrows down the arrival years to 1851 - 1855, but still no joy with NSW, Vic, SA, or Tas.
Debra