Emotional development in kids evolve as they grow. Understanding the feeling states and expressing in the right way is a part of the development process. Self harm in kids who are still trying to learning about emotions and ways to express them is very common.
Next Steps
parents need to have patience while teaching their kids how to express both positive and negative feelings in the right way. there are many ways to do that , while playing, story telling, and also to helping them understand that having an emotion and expressing is not a problem, be supportive. kid should not be made to feel guity for expressing , but expressing in right way needs to be taught to them.
Health Tips
Be patient with her, explain to her in different ways how to handle and express emotions in healthy manner and become her role model , she will learn how you and your family members react and handle different emotions.