Your wife need to mail her original I-94 and original boarding pass plus anything that can prove her departure or staying out of US on certain days, back to USCIS. Please refer to the follwoing link for address and detail:
http://www.usembassy.fi/visas/faqvisas.htm
Good luck.
http://www.usembassy.fi/visas/faqvisas.htm
Good luck.
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