No, everything seems fine. As this is marriage based N-400, both of you are expected to attend the interview.
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Not a problem ... other than that she needs to come to the interview in 3-6 months.
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You will be fine. Your spouse must attend the interview with you.
The answer provided here is general in nature and does not take into account other factors that may need to be reviewed for a more precise answer. You should consult with an immigration attorney before taking any action. The answer here is not intended to create an attorney-client relationship.