She can
1. use old and valid I-94 to re-enter. or
2. use an entry of her valid visa to enter and get a new I-94.
Whether her B visa is valid or not will not be affected by this Canada trip. It depends on the validity of B visa stamp in her passport.
1. use old and valid I-94 to re-enter. or
2. use an entry of her valid visa to enter and get a new I-94.
Whether her B visa is valid or not will not be affected by this Canada trip. It depends on the validity of B visa stamp in her passport.
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