If your GF has had less than $5050 of income (not counting any Social Security) and has lived with you all year, you can claim her as a dependent for the $500 credit for other dependents.
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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