The TurboTax calculations are correct. Deceased taxpayers who died after January 1, 2020 are eligible for the Recovery Rebate Credit on their 2020 tax return. The credit amount will be any amounts not received in rounds one and/or two. So in your mother-in-law's case the $600 not received for round two would be correct.
Here is a link with more information on the Recovery Rebate Credit. See Topic B, question B12.
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