8老师，您好！
我女儿用TN签证在美国工作，还有几个月她的签证就到期了。
-She may discuss it with the employer to see whether her TN status can be extended before it expires.
因为她是加拿大籍，我听说到期后它还可以在美国待最多180天，想问问您是这样吗？
-No. When her TN I-94 expires, she has to leave US unless her TN extension application is filed before the I-94 expires.
我们住在美国，想让孩子和我们多呆些日子。
-If her employer do not extend her TN status, she may file I-539 to apply for change of status from TN to B2 before TN I-94 expires. Thus, she can stay in US for a while.
谢谢！
