You are correct, dependents do not receive a stimulus payment. If your grandson's tax return claimed his domestic partner as a dependent, there should have been a $500 credit for the Credit for Other Dependents. If so, that would have to be paid back if his return is amended to not claim her. An amended return can be filed, but it will have to be printed and mailed. The processing time for amended returns is usually six - eight weeks. She may not be able to file the short form you refer to, since a return has already been filed with her on it.
To file an amended return, see: How do I amend my 2019 TurboTax Online return?
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