Repeat question ... see my other response.
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This is a more complicated answer than a few sentences. Also a good answer will require more information from your end, so schedule a consultation with an experienced attorney.
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She contacts the consulate; schedule an appointment; gets visa and comes.
that depends on the strength of your H1B
Yes she would be able to.
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Ideally contact your employer to help out with the process. If it is not covered, your wife will independently apply for H-4 at the Consulate. For documents, check out the Consulate's website. The visa is not "changed." She will be granted H-4 in addition to her B1/2 or they may cancel it. It is up to the Consulate's discretion. Yes, she can travel and re-enter on H-4.
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