re: "You have a basket full of shite and I'm paying for it!"

Everything happens for a reason. Sometimes there are opportunities in these type situations. Imagine if your mom simply talked to the woman in a loving way and explained to her what she was doing in reference to the sister and her condition? Plus, the woman would have been forced to listen to your mom, since your mom was probably ahead of her in line, then the lady would have to stay in line and endure her blunder until she finally left the area. Maybe, she would have even learned some important life lessons. Maybe your mom could have turned it into good right then and there. Maybe it will still happen, or already has from guilty conscious. Interesting how the seeds are planted all the time, even by the one displaying foolish actions for positive response and even life-changing attitudes on both sides. It does take courage to act upon chances in the correct way.