If your 24 year old had any more than $4300 of income in 2020 you cannot claim her---since she is too old to be a qualified child and had too much income to be a qualified relative.
If she had less than $4300 of income (not counting Social Security) then you might be able to claim her as a qualified relative and get the $500 credit for other dependents for her. You do not get stimulus money for claiming her.
CREDIT FOR OTHER DEPENDENTS
https://ttlc.intuit.com/questions/4499708-what-is-the-500-credit-for-other-dependents-family-tax-cre...
https://ttlc.intuit.com/community/children-dependents/help/what-does-financially-support-another-per...
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
