My question involves a roommate in the State of: Illinois

I signed a year lease with a roommate whose name was not put on the lease due to her personal circumstances. Everything, including utilities are in my name. Due to issues that can not be resolved I no longer want to live with her. She has a very bad temper and can become very aggressive, breaking things, harassing and assaulting me. I gave her the option of staying in the apartment with another roomate and they can just resign a new lease or she can leave. She is basically refusing this saying she will have a roommate in three months and until then she is staying and says I can't make her leave or sign anything. I would like to know my options. I want to have her out of the apartment or have the entire apartment sublet by Spetmeber 1st. Thanks for your help