If you obtain a divorce, your wife would no longer be entitled to H-4 status.
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If you file for divorce, her H4 visa will not be valid anymore as she would no longer be considered your spouse/immediate relative. However, you should consider the impact on your child and parenting before you do anything. Consult with an immigration attorney for best results directly.
Gunda J. Brost Brost Law Office This advice does not form an attorney-client relationship and is merely informative. It should not by itself be relied upon to address a legal concern.