Mind problem. So what i do?

Hello Friend, Good that you are seeking a help here. . Your sister might be going through some stress or tension at studies or work.. Anger is an expression of uncontrollable stress or tension. Sometimes it's outburst due to bodily discomforts like excess heat, PMS, acidity etc.. It's quite common for people to accept such emotional disturbance as a problem and ask for help. Just convince her that such is are just like any physical illness and can be addressed through counseling session and few lifestyle changes. If she hesitate to meet directly, online counseling is a best option.. You can suggest that. Feel free to reach out to me online through Practo app for further evaluation and recommendation..