What to do about a psycho ex gf that is relentless ?

I work in group homes - I transferred in November to another house. Yesterday she came there for a shift to make trouble for me. I have evidence to prove we were together a photo of us, I have files to send to police , seperate and different files to send to to my head office HR and managers. Is there anything else I can do.Will also go to police with files on death threats etc and she threatended to slander me witha abusing her kid - ( her kid kicked me in the nuts and fell down and cried ) I keeled over Please dont say talk to her / reason with her. In the past she pulled a knife on me - drove her CRV at me when I dumped her. I walked away from her so as to ' be a man ' RIGHT ? not whine about woman that is dangerous and not be a RAT on my coworker . Now she come to destroy me and my career for revenge of me dumping her. Dont say for money she has four jobs and makes over a thousand dollars a week. Please anyone experienced with this advise me. I have never done this before though I should have once before too - I will do it this time. These files of past events are still good - I walked away and tried to be peacefull but she wants to wipe me out with my career as she has done before to others. I seem little fanatical here but as you can see I am dealing with a pro scammer and need to cover all bases. Any other advice - how about going about it in which manner. I will be doing it all on tuesday when everything is open after the easter holidays. Please any advice - now I have to do it. I tried to walk away