If you did not live together for the last six months of 2025, you do not have to amend,- she is eligible to file as Head of Household. For Head of Household, she would be "considered unmarried" if you lived apart during the entire last six months of the tax year and she paid the expenses of the household. She will be able to show her apartment so the duplicate address of your sponsor does not matter if she was not actually living there.
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