Dependant got a stimulus check

I'm getting ready to file my taxes but not sure if i can use my sister as my dependant because she got a stimulus check. She does qualify as a dependant but i'm wondering if there will be a issue as in her having to pay the check back. She did state on the irs website ( get my payment) that no one can claim her as a dependent. This will be the first time i will use her as a dependant on a tax return.