Was your wife still in a valid nonimmigrant status when she filed a change of status to H-4? If so, she can remain in the US until USCIS makes a decision on her I-539. If she was NOT in a valid nonimmigrant status at the time, USCIS will deny her I-539 and she needs to leave the US within 180 days of the expiration date of her I-94 to avoid incurring a 3 year bar. You should consult with a qualified immigration attorney for advice specific to your situation.
If she was in lawful status at the time she filed for a change of status, she is allowed to remain in the U.S. until there is a decision.
The above is intended only as general information, and does not constitute legal advice. You must speak with an attorney to discuss your individual case.
She is in a period of authorized stay al least until the USCIS makes a decision on her change of status application.
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You appear to be concerned about your lawful stay in the United States and wish to remain in the country legally. If that is in fact correct, delegate any of your issues to the counsel of record, as legally appropriate in this situation.
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As long as she filed while in lawful status, she remains in a period of authorized stay until adjudication.
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.