Definitely bring copies of ALL the documents that you are bringing to the interview. Make sure you organize them in such a fashion that would allow you to quickly find the necessary document.
USCIS needs to verify that your wife is indeed a US citizen. While her US passport is usually a sufficient proof of that, sometimes (usually when there is a doubt as to the authenticity of the passport), USCIS may request to see a Certificate of Naturalization (for those who naturalized) or Birth Certificate (for those born in the US). Since your wife was not born in the US, her birth certificate should not be required to adjust the petitions/applications for adjustment of status.
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The interview form is generic. Thus, it may ask for you to bring 'impossible' things.
Yes, even if you sent in copies, bring the originals to the interview.
As for her birth certificate, she should bring the birth 'verification' documents she submitted when she immigrated to the US.
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It is always best to have copies that one can provide USCIS with at the interview in case the previously submitted copies have been misplaced.
J Charles Ferrari Eng & Nishimura 213.622.2255 The statement above is general in nature and does not constitute legal advice, as not all the facts are known. You should retain an attorney to review all the facts specific to your case in order to receive advise specific to your case. The statement above does not create an attorney/client relationship. Answers on Avvo can only be general ones, as specific answers would require knowledge of all the facts. As such, they may or may not apply to the question.