Well, first, she CANNOT marry another U.S. Citizen to be able to use that marriage to stay. This is not allowed when someone comes into the U.S. on a K-1. There are no exceptions to this. So she would have to leave the U.S. on time and the new U.S. Citizen would have to file a new I-129F petition for her so she could get a new K-1 to come to the U.S. OR, the new U.S. Citizen can marry her and file an I-129F or I-130 to do a K-3 or CR-1 immigrant visa. But either way, she MUST leave the U.S. on time to be able to process outside. Plus she would also have to prove that the new relationship is real.
Really, there are only two ways under her current status for her to stay in the U.S. at this time and neither of them would have to do with a new relationship:
1) She would apply for Asylum and prove that she was being persecuted in Vietnam because of her race, nationality, religion, social group or political opinion, or
2) She would have to report the abuse to the police and help the police and/or prosecutor and then apply for a U visa that can eventually lead to a green card.
Here are links to information on both options:
I am truly sorry, but the K-1 is one of the worst visas to have. If she doesn't take one of those two options, then she will need to leave the U.S. to process to come back again on another K or other visa.
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