So sorry for your loss. You can still claim your mom as a dependent for 2022 and get the $500 credit for other dependents if you were supporting her in 2022 up til the time she passed away.
CREDIT FOR OTHER DEPENDENTS
https://ttlc.intuit.com/questions/4499708-what-is-the-500-credit-for-other-dependents-family-tax-cre...
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