Your employee has to provide you with a W-4 form that contains the information she wants you to use when calculating her withholdings. Without a completed W-4 form, you have to withhold as if she were Single with no dependents or adjustments at all.
From page 24 of the IRS's Publication 15: Employer's Tax Guide:
If a new employee doesn't give you a completed Form W-4 in 2024 (including an employee who previously worked for you and was rehired in 2024, and who fails to furnish a Form W-4), treat the new employee as if they had checked the box for Single or Married filing separately in Step 1(c) and made no entries in Step 2, Step 3, or Step 4 of the 2024 Form W-4.
My recommendation would be to send her the link to the TurboTax W-4 Calculator or the IRS Tax Withholding Estimator so that she can use those tools to give you the form that you need from her.
Thank you for participating in this event!
-- KimberW
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