I assume you are speaking about the w-4 and your state deductions. If this is correct, since your wife has not changed her withholding's from single to married, that means that the taxes that are being withheld from her pay is at a single rate not married rate (which is lower).
Depending on your tax situation, she might be having more taxes withheld than is necessary, which means if you file your tax return as married filing jointly, a refund could be possible.
What is extremely important is how you file your 2017 tax return. You two need to either file as married filing jointly (MFJ) or married filing separately (MFS).
Your wife can always change her tax withholding's with her employer anytime.
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