Why would a girl I rejected try to set me up with her friend?

There was a girl I used to be somewhat into but ended up rejecting. Surprisingly she just said okay and continued being friendly toward me. Last week she brought one of her friends and winked at me while telling her friend about my good qualities (like she’s trying to set me up with her). I’m not sure what to make of it.
Why would a girl I rejected try to set me up with her friend?
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