She just likes the high of drama. When emotions are running high some people get an adrenaline rush. It’s why for some people makeup sex can feel great. Since their body is full of adrenaline after a verbal fight. They’re basically adrenaline junkies, but instead of base jumping of a bridge they achieve their high trough drama. So when they get into a normal relationship they are numb to the highs and lows of this kind of relationship. Since they are used to extreme highs and lows. They go into withdrawal in a normal relationship and then they feel unhappy.