In 1851 Marion is working as a servant and residing with the Bradford family aged 14 at Inverness. Her surname is spelled "McBean". 
Marion arrived in Australia aged 16. aboard the vessel "Georgiana' She is listed on the passenger manifest as a domestic servant, and that she is coming to Australia to join her brother in Geelong.
Marion married Edward Smith (1819-1898) in Victoria in 1853. A copy of the marriage certificate states that her parents are Donald McBean and Flora McLeod, and that she was born in Glasgow and her father was a labourier. Marion sighs with her 'mark' and is illiterate. Edward signs his own name and states his birthplace as Birmingham and profession a "bricklayer'. his parents are Thomas Smith (a mason) and Elizabeth Thomson?. she is aged 21 and he is aged 26. 
Robert Thomas Smith 1858- Vic BDM Birth # 12780 / 1858 Archibald Smith 1856– John Smith 1860– Vic BDM #8073 / 1860 mother SARAH MCBain. Elizabeth Smith 1861– # 20418 / 1861 (mother surname listed as MCBEAN) Edward Smith 1863–1902 # 9555 / 1864 mother Sarah MCBEAN Mary Anne Smith 1866– # 15659 / 1866 mother SARAH MCBEAN [[Esther Smith 1868–1947 William Howard Smith 1871– #360 / 1871 mother SARAH MCBANE Florence Smith 1873–1945 Sarah J. Smith 1877–1940 Christina Margaret Smith 1879– 6900 / 1879
Answers to questions: there is information on Ancsetry that indicates that her fathers name was Donald Kenneth McBean/McBain and her mother was Flora. History shows that people changed their names or used different names - she might noth ave liked the name Marion and might have adopted a middle name as her first name, or it may be a name that the family gave to her out of respect to a deceased family member. Its not unusual. Other factors - the BDM transcriptions on death indexes are sometimes wrong - becuase the informants don't' know the details (particularly if the persons spouse has predeceased them), and because the chidlren didn't physically meet some of their grandparents. Having gone through the BDM I can't see another potential death for Sara/Marion and the family trees on Ancestry might have different parents listed (and the birth not sourced), but they consistently have her deceased as 1905 (family knowledge?). The marriage certificate links Sarah/Marion to Donald and Flora. Unable to find a birth source- or lock down the birth date and this might be because Marion was illiterate.
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