Lizabeth is very childlike in this seen because she is throwing pebbles at Ms. Lottie when she was in her yard. They were also chanting things like " Old Witch fell in a Ditch"
Lizabeth started to transition when she saw her father crying over the great depression. That gave Lizabeth a sense that even adults have feelings
She finally transitioned into an adult when she pulled out all of the marrigolds in Ms. Gotties yard, Lizabeth finally realized that everyone has feelings. After that she finally determined that was the last act of adulthood.