If the return was filed, she will need to amend, but wait until the original has been processed.
The IRS is cross-checking for the stimulus, so there is a very good chance they will add the recovery rebate credit to her refund without the need for filing an amended return.
You have 3 years from the date you filed your return (or 2 years after you paid the tax due, whichever is later) to file an amended return.
Please click here for how to amend a return you already filed
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