It would be nice if the casino had a little more decency. While they clearly don't owe her $42 million legally or ethically, they should at least own up to the fact that seeing such a huge payout is an incredible heart attack moment and that their fuckup caused her a lot of grief. They should have paid her more than a comped steak dinner.
But ultimately, why would they? If you walk into a casino to play you are by definition stupid, weak and easily fooled. They don't need to pay her squat because she's going to be back to her nickle slots and lottery scratch-offs tomorrow. That's who she is, that's why she was there and she's going to keep playing no matter what. The bad press won't cost them any customers, so there's no incentive for them to do anything else.
Note to the fuckwit who got laid off and decided to give her money to a casino: Use this as an opportunity to grow a brain. Stay the fuck out of casinos entirely and set up a few interviews instead.