The very fact that she wants to be 'a better person' indicates that she is aware of her behaviour but has very little, if any, control over it. Common side effects of Strattera are irritability and fatigue, these two together would be enough to make anyone somewhat short tempered. It may be worthwhile to ask her to try very hard (depending on her age) to listen to her body when she is about to start a fight - does her stomach get tight, her head hurt, her eyes water etc. If she can identify when these are happening she may be able to remove herself from the situation prior to starting a fight. Perhaps start this at home (assuming she fights there too) and develop a 'safety word' that she can say when she starts to feel she wants to fight. This might also give you some insight into the triggers of the behaviour as well as helping her identify if she is angry, afraid, intimidated etc.
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