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In the meantime, my advice to you should consider pre-empting her potential false allegations by contacting immigration and advising them that she has threatened to make up allegations that you are psychologically abusing her. Her case against you will look far less credible if she makes such allegations only after you end the relationship and notify immigration.
The reason she may pursue such a course against you is because there are provisions in the immigration law that would allow her to stay in Australia even if you withdraw your sponsorship if she has been subjected to abuse by you. Unfortunately, whilst these laws were brought in so that women who are being abused by their sponsor don't feel trapped, the effect of the laws is also to induce other women to make false accusations so they can stay.
To succeed in an application to stay because of your abuse, she will likely need to establish that you have been abusing her in some way, and to that end may well be contriving circumstances to make such an allegation. She could do this by making complaints to the police, etc. If you think this is what she is contemplating, then I think your best course is to separate from her immediately and notify the department of immigration of the allegations she has threatened you with. You will find your defence of such allegations much easier and more credible if you can show that she only made these allegations against you once you withdrew sponsorship.
Whilst deciding what to do, I would suggest you avoid situations where she can later claim you have abused her in some way, so avoid having heated discussions in public or acting in a way that observers may perceive as abusive, as this will only support her threatened allegations.
I trust the above assists.
Good luck and PLEASE RATE MY ANSWER.