If she files a tax return that claims the dependents on her return as well, the IRS will review both returns and ask for documentation that shows who gets to claim the dependents on their return. Once they determine who can, they will adjust the other return to remove the dependents and any other adjustments that are needed. That parent will need to pay back any refund that came with claiming the dependents.
She can call the IRS, but until a return it is filed, they will not do anything,
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