What is the ruling on the continued presence in university housing of a girl who sexually and verbally harasses her friend, and is it unjust to consider her afflicted with perversion, and how should she be dealt with?

It is not permissible to accuse a girl of perversion based on assumptions and delusions, and one must have a good opinion of Muslims. However, if there is obvious suspicion in her actions, she must be enjoined from evil. If she does not desist, then her friend should avoid associating with her. If she does not refrain except by having her matter raised to someone who can deter her, then that becomes obligatory. If the girl repents, then repentance erases what came before it. You do not have the right to expel the girl from the accommodation if it is not your property, or if she is a tenant and the lease term has not expired, as a lease is a binding contract that cannot be rescinded except with the consent of both parties or upon the expiry of the term.