>>>Duh, she was paying cash up front.
If something happens you can usually take the license number and description of the car. Or pass a law you can’t cover your face.<<<
Paying cash upfront is irrelevant. After handing him the cash, she could have pulled out a gun and robbed and possibly killed the cashier.
And after the cashier refused service, she could have pulled out a gun and robbed and possibly killed the cashier. If that was her intent, the cashier's actions would not have made a difference.