Not sure if claiming your sister endangers her housing or not. But slow down about trying to claim her just because she stayed with you for a couple of months. Can you actually say that you paid for over half of her support in 2020? What are you trying to do? You will not receive stimulus money for claiming her. And if you claim her SHE will not receive stimulus money.
Read the rules for claiming someone as a qualified relative VERY carefully and look carefully at what it means to support someone else---did you really support her? If not then do not put anything about your sister on your tax return.
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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