Absolutely nothing. She may have adopted or is wired to have a more "masculine" persona that is not as emotionally reactive as other girls or interested in the things that attract other girls who have adopted a more feminine "gender role". [A gender role are the societal expectations associated with gender.] She may have brothers who have socialized her in this way.
Julie is not on the same emotional page as her female classmates. They don’t understand her, either.
Her female classmates are confused over her intensity because they have learned to temper theirs. They have more ability to observe and monitor themselves than Julie has. They more readily adjust their behavior to fit situations. Julie has yet to learn these skills and stands out as a result.
Julie is a "get to the point" kind of girl. Her assertiveness is misinterpreted as bullying because her leadership style is different from the other girls.
Help Julie to see how her behavior impacts others. “Julie, you may not be aware that when you get mad so fast, it scares the other girls”. Reflecting the behavior instead of judging will help her to develop insight and self-monitoring skills more quickly. She may hold those girls in contempt and think of them as being "silly" or "stupid" and may need to understand "where they're coming from" versus judging them.
Help Julie to identify her strengths and channel them in the direction that makes her a self-sufficient and satisfied person.
Just do the best you can, Claudia
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