As long as it was your sisters card that made the deposit and shes verified, shouldn’t be a problem.
If you have used your own card, then the best outcome you can hope for is a refund of the initial deposit and then account closure.
I take it you are withdrawing xrp? If you go to your crypto wallet, head to xrp and look for receive coins. Your address and destination tag will be there. Copy and paste them into the withdrawal page on casino and confirm.