This scene shows Joey and Lizabeth going to Miss Lottie's house and destroying her marigolds. It is important to the plot of the story because it shows us the beginning of Lizabeth starting to question her behavior and the way she should act.
In this scene you see Joey asleep and Lizabeth awake, listening in on her parents conversation about money and pride. Lizabeth starts to realize how serious their conditions are and she sees how it has affected her parents. This is very important because her hearing this conversation also affects Lizabeth.
In this final scene you see Lizabeth on the floor crying after destroying Miss Lottie's marigolds and Miss Lottie, acting more sad than angry. Lizabeth is confused with how she should be acting at this point and does one more act of showing childlike behavior before deciding it's time to mature. This scene is important to the message of the story because it shows how Lizabeth has made that switch from being a child to a young adult.