irish famine orphan australia

[Rustor]

Hi everyone,
Have come to a brick wall, would anyone know how to find data on orphan.
Margaret Fitzgerald born about 1835 in Queens Co.
 Parents John Fitzgerald and Julia [surname -think written as Kahgeri] and perhaps as often the case phonetically spelt which would then be ??
Any leads would be appreciated.
Arrived in Victoria on board the Pemberton 14 May 1849. Formerly nursemaid aged either 14 or 18.
thank you
regards rustor