<human>: Looking for best advice on how I should proceed.

My (31M) ex (30F) showed up at my house today and started hurling the big flower-bed stones at the front door and siding, causing some damage.  

The house is mine and we lived in an "adult interdependent relationship" (common law) for just over 3 years and she left 7 months ago.  I made up a thing for her to sign finalizing dividing shared assets and that was it.

When she started, I opened the door, saw her screaming, closed it and locked the doors and called the cops.  Never opened the door after that even though she kept throwing things.  She stopped and sat by the shed for the last 8-10 minutes and the cops arrived and talked to her.

This part makes my blood boil.  They let her just leave!  They then talked to me and said there wasn't much damage and they weren't going to charge her with anything.  I walked around and saw that there was in fact a ton of damage, not to mention the general vandalism of having chairs/stones/whatever-she-found thrown around the yard and the flower beds torn up.

The cops countered that because we used to be common law and nothing went through lawyers the house was half hers as far as they were concerned and they couldn't do anything.  Admittedly I haven't seen a lawyer yet but from what I've looked into this is purely false and they were being lazy/incompetent.

Anyway, disregarding the shoddy police work, I'm not sure where to go from here.  I asked them and they said to go get a "peace bond" in the morning and then look into a restraining order.  I don't care about getting her arrested but I'd like some way to prevent this from happening again.

Can you summarize the given text in a few sentences?
<bot>: Common law ex showed up, smashed up my house, cops came but let her leave and told me it was a civil matter.  What are the steps now?