This incident is actually a prime example drawn to caricature, of how it is that a person's self-image is so vastly different from reality. This woman thought she had a good idea, thought she was capable of executing it, and look what happened?
How many people in their lives "think they have a grasp on things" decide to act a certain way based on that totally erroneous idea, and then find that they've made a HUGE mess of their life, somebody elses life, or some situation? All because they started with the assumption that what they thought in their heads was based on objective reality?
It's really sad because it is completely symbolic of the human condition in so many ways.