Originally Posted by JJeffrey

No, if she's flying UA to ORD and then QR from ORD on a separate ticket then AA doesn't have anything to do with bags. She'll have to claim her bag at ORD then take it to T5 to check in with QR. I'm not sure what UA's policy is with regards to checking bags through across separate tickets, but I suppose you could always check on that as well (look on the UA forum, etc.). QR check in at ORD should be open 3 hours before departure but that's something you would need to double check with QR on as well.