If your mother had more than $4300 of income in 2020----at any time in 2020----then no, you cannot claim her, even if you helped while she waited for her unemployment.
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...
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