回复:请有经验的好心人帮帮忙给个主意. 多谢! 去海关移民局可以改B2在美的居留时间吗?

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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