Having heard only one side of the story I need to ask....what part of the problem are you? If you can truly say it is not partly you then you can pull extreme measures such as, if you rent terminate the lease and move. If you own change the locks, move her things to storage, get a friend to stay with you for a few days and alert the police there may be a problem.
Asking her to go will not work nor will deadlines. She is the one that has made the bed now you need to let her to sleep in it.