Everytime my girlfriend gets mad she wants to ruin me?

Everytime my girlfriend get angry and I want time apart she suggest that she will call the cops and get me in trouble for something. Other times she suggest that she will call my work and make something up to get me fired. At this point I am terrified so thats why she is still here. Mind you she does not work and has'nt worked for the entire duration of this relationship. What do I do?