If your GF had less than $4300 of income in 2020 --- not counting Social Security--- and she lived with you the whole year, you can claim her as a qualified relative. You will get the $500 credit for other dependents for claiming her, and the 3rd stimulus check of $1400. You do not get the first or second stimulus check for claiming her.
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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