The immigration system does not get involved in marriage, unless one person is dependent on the other person for their visa. So if your wife was on F-2 or J-2 to your F-1 or J-1, then it would be a problem.
Also, a B1/B2 visitor visa holder can get a divorce while in the US. However note that a F-1 or J-1 holder is in the US for a longer period of time, and therefore can establish domicile in the US and get a divorce.
For the purpose of divorce, "residence" is different than for the purpose of immigration. Each state determines the rules for divorce, and the state in which a person resides is their state of residence.
So again, there is nothing you can do to stop this, in terms of immigration. The state has granted her the right to divorce you and granted her the divorce.
I'm very sorry.
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