I assume she is getting the rent paid direct to the landlord by benefits so she is not going to default on it.
Sorry, but there is little you can do, she has to live somewhere and even if you could get her evicted you would just be passing the problem on to someone else.
Attempted murder is a definite prison sentence , so you will just have to hope she gets convicted.
I am actually surprised that she is on bail for such a serious offence , I would have thought she would be on remand or in a secure bail hostel. Can you find out her bail conditions ? she may be breaking them and the court could order her to be placed in custody.