The calculations appear to be correct. The Recovery Rebate Credit on the 2020 tax return is based solely on the 2020 tax return information. A taxpayer who died after 1 January 2020 is eligible for the credit on the 2020 tax return.
If your mother-in-law is filing single and her adjusted gross income on the 2020 tax return is below $75,000, she will be eligible for the full amount of stimulus payments (1200 and 600). If she did not receive any stimulus payments in rounds one and/or two, for any reason, then the Recovery Rebate Credit will not be reduced at all on her 2020 tax return. The full credit will correctly be added to the return.
Here is a link for more information on the Recovery Rebate Credit. See questions B1, B2 and B12 for your situation.
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