I'm sorry for your loss.
You can file the final return for your aunt whenever you have all the documentation (W-2s, interest & dividend and brokerage statements, mortgage interest, property taxes, etc.). Keep in mind that the tax deadlines are the same for a deceased person as they are for the rest of us.
When you are preparing your aunt's return, make sure to note on the Your Personal Info screen, in section 3, that "I'm preparing this return for [XX], who has passed away."
[Edited | 3/26/2020 | 8:30 am PDT]
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