The Instructions for Form 1040 state on page 12: The person who files the return must enter “Deceased,” the deceased taxpayer's name, and the date of death across the top of the return.
and on page 59: filers requesting the deceased taxpayer's refund must file the return and attach Form 1310.
You will need to sign according to your status, in her signature spot, see How to file a final tax return for someone who has passed.
The IRS has a quick How Do I File a Deceased Person interactive assistant. It is very detailed and may give you additional information.
See Can I e-file a tax return for someone who is deceased?
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