回複:請有經驗的好心人幫幫忙給個主意. 多謝! 去海關移民局可以改B2在美的居留時間嗎?

It's up to CBP. You should try that first, cheaper. The other option is to reenter at Canada (needs Canada visa) or Mexico border and ask for a new I-94, if her B2 visa is valid for one year.

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