You may want to consider getting an IRS Transcript to see what they have for your AGI.
I am sorry for your loss.
You can use the IRS Get Transcript tool. Try the online option first. If you are unable to obtain the transcript online, you can have one sent to the address the IRS has on record for you. You can find IRS Get Transcript here.
Form 1310, Statement of Person Claiming Refund Due a Deceased Taxpayer, is not required in your case and would not do you any good.
From Form 1310 and instructions:
"If you are claiming a refund on behalf of a deceased taxpayer, you must file Form 1310 unless either of the following applies.
- You are a surviving spouse filing an original or amended joint return with the decedent.
- You are a personal representative (defined on this page) filing an original Form 1040, 1040-SR, 1040A, 1040EZ, or 1040NR (1040-NR beginning in 2019) for the decedent and a court certificate showing your appointment is attached to the return."
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