You do not need to prepare an amended tax return to prepare Form 1310. This form can be mailed into the IRS separately.
Please see the attached link for the blank form and instructions. Assuming you are filing as
Blank Form 1310 - Statement of Person Claiming a Refund Due a Deceased Taxpayer
You will need to mail this form to the IRS office where you file your mom's return.
Please see the attached link with instructions on where to file your return. The addresses vary by state.
Addresses to file a return with the IRS
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