If you filed Married Filing Jointly for 2018, the spouse's Adjusted Gross Income is the same as the other spouse. The 2018 AGI can be found on the 2018 Form 1040, Line 7. It would be the same for both of you.
I am sorry for your loss.
If your spouse filed Married Filing Separately, you will need to look at a copy of the spouse's Form 1040 on Line 7.
The IRS says that the surviving spouse may file a Married Filing Jointly return by e-filing, but in practice, many surviving spouses must file by mailing in even if they have the AGI correct.
You can read more here.
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