I don't think she would have waited this long to involve police. This isn't the first time he's sperged out like this, he's literally been doing this on and off for two months or so.
Take her history: she sent him to Jesus Camp instead of sending him to rehab (which could have actually made a difference), she burned his weed instead of report it to the police, etc... there have been a million good opportunities and reasons for her to get official help involved, but she hasn't taken any of them, and given the amount of police attention his activities should have attracted so far, I think she's actively shielding him from law enforcement. I think one part of her understands that if she actually asked for help from police, Jace would get put away forever, either in the legal system or in some sort of mental health facility.
This is all ignoring the bigger problem, which is that if police bust down anything, Jace is going to parkour at them "duel-wielding" BudK tactical throwing knives and possibly get killed, or at the very least injured.
He had a factory-condition beige Toyota Corolla (which he claimed was "customized") that he totaled in a DUI accident sometime in early 2013.
Well, the thing is, Jace isn't a troubled teen. He's 20 at the youngest, 22 at the oldest. So none of this is really applicable anyway. He's a legal adult with all the rights that entails (save for those that got taken away from his felony charge)