This is income in respect of a decedent, income that would have been included on her final return if it was received in the year of her death. Since you filed her final return, and because you received the income as beneficiary, you can report the income on your tax return. See Income in Respect of a Decedent
You can enter as Miscellaneous Income with "1099INT IRD with her name and last four of social" (or something similar).
If you determine the amount of income tax you paid on the amount, you can deduct under Other Deductible Expenses- Estate tax deduction not reported on an estate K-1.
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