My grandmother passed in May 2020 and Turbotax is telling me she should get a $1800 federal refund since she didn't receive stimulus payments last year. Is that correct?

[tagteam]

Yes, it is correct. She qualifies for the rebate credit.

See https://www.irs.gov/newsroom/questions-and-answers-about-the-first-economic-impact-payment-topic-a-e...