After being supportive, do not forget to please her. A harsh person deep down feels like she is not good enough. She always whines other people because she feels that she cannot control things. Therefore, do not forget to appreciate her like “I know that you want to make things better. I know that you are willing to do this.” You should keep doing both time when she is angry or when she did good things. For example, when your mom cooked food for you, tell her that “Thank you mom, I know that you are tired, but you still cooked this for me. That’s very kind of you”.