Normal
The reason she could be evicted is because of nuisance laws. Many states have laws that require landlords to evict tenants that frequently violate the law. One of the criteria is frequent visits of the police to an apartment. The unintended effect of these laws is that many domestic abuse victims are afraid to call the police when their abuser is violent for fear that they will be evicted. I think you should talk to your landlord about your situation to see if he/she would guarantee that you would not be evicted if you called the police a few times