this sounds like a scam. first, she probably did not tell you about
her angry jealous boyfriend/husband in china, who is also a vicious
stalker and gang member. She wants to use you to make him jealous --
or as an excuse to dump him. You will be expected to fight him and his
gang to the death.

second, she probably wants to marry you for your green card or money.
so, she will trap you into some kind of crazy chinese marriage ceremony
and you don't even know it. once you are legally married in china, you
are legally married. she is entitled to austrailian citizenship and
1/2 of all your possessions when she divorces you. Can you say
alimoney?