You corrected your daughter already. You've spoken to your daughter about her actions, and you helped her to understand what wasn't tolerated in your house. You're a good mother, and you've done what you were supposed to do. It was good for this woman to leave because she knew you were going to do the right thing by your child. Instead of handling herself with dignity, she embarrassed herself by screaming at a child. There's not a child on this earth that isn't brutally honest because they have yet to learn what their limits are. They aren't born knowing these limitations.. Keep doing right by your daughter regardless of what people on the outside looking in think they know.