Maybe the school can get rid of her, but it cannot get rid of everyone who refuses to be a model student. And even if the school does remove her from its campus, it cannot remove her from society. By welcoming all students and communicating that we care about them, we have a better chance of influencing their behavior than if we threaten them. It's easy to welcome students who do what we want. Far more difficult and more important is how we welcome students when they don't do what we want.
Schools can no longer create and support an underclass of marginalized students.
Of course, this does not mean that we should tolerate or accept all behaviors. Every rule violation requires effective consequences, especially those that teach alternative behaviors. Every time students break a rule, respond violently, or are disruptive, we must include in our intervention the sincere message that we still want them in the classroom and that we want them to continue to learn. Maybe that will teach you. I missed you.