Her super power is a fervent belief that the free VIP Gold customer card she got in the mail somehow means that no one in the store is allowed to disagree with her
It actually only gives her 10% off and was sent to every household in a 50 mile radius, but her righteous indignation level is over 9000 and she will not be defeated
That’s the point where you just accept defeat and don’t enter your calories for that day, telling yourself you’ll somehow make up for it by not eating anything for the next 72 hours