Hello, my name is ***** ***** I will be the immigration attorney helping you today.
I cannot know for sure why she has not been deported unfortunately but I can make a few guesses based on experience from what you've told me. It could be that she received her green card based on your husband's marriage and that's why she is still here. If she was married two years to him, that is enough time for her to have gotten her green card based on the marriage. If she is a green card holder, it is very difficult to prove fraudulent marriage. It may be that there was not enough evidence to prove that she married your husband with fraudulent intentions so that's why she is still here. It could also be that the Brazilian husband petitioned her for her green card and she got it that way.
Once a couple is divorced, in most states you can no longer get an annulment but he would have to speak to a family attorney about that.
There are very specific ways to stop the sponsorship and those are the only ones. 1. When she becomes a citizen 2. When she works at least 40 quarters in the US 3. If she dies 4. If she leaves the US permanently The divorce or annullment are not enough to stop the responsibility of a sponsor.
I'm sorry I don't have better news. I hope you can understand that I don't make the laws and I cannot change it.
Good luck to you and I hope this answer has helped you!
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