If you filed jointly in 2018, her AGI would be the same as yours.
Here is a Help Article that covers the steps to correct a rejected return as well as covers printing and mailing your return if that is necessary: Rejected Returns/Printing and Mailing my Returns
Please note that I generally suggest that if your return has been rejected more than twice, that you go ahead and file on paper.
I am also including a TurboTax Help Article with more details on filing in your situation: Joint Return w/Deceased Spouse
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