Defecto visa for my partner

Hi

I am married with a son we all are PR of australia. for a year+ the relationship between my wife and myself is not good, and she left australia to her native country one year back. during this time i have developed a relationship with a girl in newzealand who is a student in newzealand. (she is not a resident and citizen of newzealand.)

I want to bring her to australia pls adivce me the possible ways to bring her legally.

I was thinking to bring her on a student visa with 2 or 3 years course and apply her in defecto visa. pls advice me what are the condition to apply for defecto visa or any other possible ways to bring her to australia.

hadi