I want my gf to come to australia with me, how?

I've known that girl for 5 years already, recently we've been going out and its great.

She is nearly done with her study and i still have a few years to go.
The thing is that i want her to come and continue her studies in australia but her family is not wealthy enough to let her come as an international student.

The subject is really serious as she wants to leave her family because of some very serious problem with her father (that i cannot tell).

I was considering doing a fiancee visa or even marriage to make her come if it would lower the cost of education. She would then be able to find a part time job in australia and me as well which would pay for her studies and make her independant of her parents.

We are still young but I really want her to be by my side rather than her leaving her family and do something that wouldnt be great for her.

I'll also consult embassies later on but I just want to know if anyone went through the process of one of those above.

as long as you are both over 18, it shold be no problem, but i would be cautious about marrying her to get her out of a bad family situation, it may be love and it may be gratitude ... but the situation isn't promising as a good foundation for marriage. you will have to foot the bill for her passage, i doubt if her parents will be willing to pay

You didn't mention her age. If she's an adult, there shouldn't be a problem with her going as long as she wants to go. It will most likely be easier if you were married or at least engaged. If she is a minor, I doubt she'll be able to go unless she gets permission from her family (mother, aunt, etc)