This is a hypothetical scenario - university question.
* Being a Hypo - I will make a few comments of no binding value.
What would be the prospects of remaining in Australia?
- [F] & [M1] met in 2003 and became engaged in 2005.
- Applied & granted prospective marriage visa (300).
- Married two weeks after arriving in Australia.
- [M1] would constantly ask for money - threaten to send [F] back to Cambodia.
- [M1] would use [F]'s money to buy drugs.
- Applied for Spousal Visa (820/801) - department refused.
- [M1] cheated on [F].
- [M1] was emotionally and financially abusive to [F].
- [F] divorced [M1].
* Reasons for refused 820/801 would be a key factor as to concerns of DIBP.
* Certain points could be a claim of Domestic Violence, that could/could have lead to PR - but this is going back a long time and may be hard to prove
* With no 820 Visa and no relationship (a divorce takes 2 years+ from separation) how was the (F) still in Australia on a valid visa?
[F] other relationship
- [F] & [M2] began relationship.
* (Dates help!!!!!!!!)
- [F] & [M2] separated.
- [M2] found housing for [F] after separation.
- house was a share house - shared room with 4 other Cambodian women.
- [F] not allowed to leave house without permission of security.
- [F] forced to have sex with men who came to the house.
- [F] became pregnant - gave birth.
- [F] thinks father is an Australian man - child has no birth certificate.
- Fear of persecution if returned to Cambodia - she will be raped and fears daughter will be stolen and sold to human traffickers.
* You really need to give a time line of when the PMV expired, and if any appeal was made on the refused 820.
* Proving the father is Australian seems a guess & unless they have their DNA on record could be from any country by the sound of it. I think I read sperm can stay alive in the body after ejaculation for around 1 week (don't quote me on that).
* Many of the matter listed here are State and Federal police matter and not migration matters.
Myself I would change Universities as that is a question that can not be answered with any helpful learning for a student - is certainly not a question to become a RMA or a Lawyer dabbling in migration rules.
So the only correct answer is - contact a very good Registered Migration Agent preferably that is or has lawyer experience and do it fast.