You cannot claim your GF as a dependent unless she lives with you for the entire year and has less than $4700 of income --not counting Social Security. If she has not moved in yet, then you will not be able to claim her for 2024, since it is already late March.
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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