Answer:
Disruptive mood dysregulation disorder
Explanation:
At various times, Cynthia, a 15-year-old high school student, has always been considered by her family and/or friends to be moody, high-strung, and explosive. She has repeatedly had severe temper outbursts that seemed out of proportion to her current situation. In between outbursts, her mood is consistently irritable and angry for most of the day. You would likely diagnose Cynthia with disruptive mood dysregulation disorder
Disruptive mood dysregulation disorder (DMDD) is a condition found majorly in children which makes them chronically irritable and experiences frequent, severe temper outbursts that seem out of proportion to the situation at hand. Children diagnosed with DMDD struggle to bring their emotions under control in an age-appropriate way. In between outbursts they are irritable most of the time.
This is what Cynthia is suffering from