Can my de facto partner take half of my money?

I am living in a de facto relationship with a foreign girl who I met here in Australia, so I can support her with a bridging visa after 1 year. I am Australian citizen but the girl is not. If this relationship breaks up and ends sometime in the future, can she take my money away from me? I have a large term deposit in the bank which is my inheritance from my uncle and I got this before I met her. She does not know the amount but she knows I have money. Do you think she can take half of this money away from me? What can I do to make sure if she leaves me she gets nothing from it, and I mean 0.