If you claimed your mother as a dependent all you get is a $500 credit for other dependents on your income tax return. The $500 stimulus is only for children under the age of 17, so no, you will not receive $500 stimulus for claiming her. And she will not get the $1200 stimulus since you claimed her. Dependents do not get the stimulus checks.
https://ttlc.intuit.com/questions/4499708-what-is-the-500-credit-for-other-dependents-family-tax-cre...
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