My sister hacked my phone to pieces with a meat cleaver?

Long story short, my 31-year-old sister hacked my phone to pieces with a meat cleaver because she got angry at me (I'm 29) after a verbal argument that she started. She still lives with my parents and I just came to visit for a couple hours. After our argument, I went downstairs to leave and she stormed after me - enraged. She snatched my phone out of my hands, ran to the kitchen, grabbed a meat cleaver from a drawer and started hacking away at it like she was Michael Myers. I've never seen an episode like that from someone. She then looked at me with the meat cleaver and screamed, "Do you want to **** with me again?!"

I don't even want to think about what would have happened to my hand if I tried to grab my phone during that scene.This girl has had a lot of issues over the years (e.g. a 3 month marriage). This is NOT an isolated incident, but it's never been this crazy. What worries me most is that she did this with her 3-year-old daughter (who she shockingly has full custody of) right upstairs. Whose to say the next time she won't let it out on her or someone else?So far, I've gone to the police but I told them I didn't want to press charges. They came by my parents' house where she lives with her daughter (my parents weren't home) and she apparently lied and painted a completely different picture.

Should I press charges or just let it go? I don't think it's normal at all for people to grab meat cleavers when they're angry and start going crazy.