Well, like I said, a very Lawful alignment person would pursue a case against her. She broke the law.
I bet there could be regional impact to the decision. I think a big city DA might pursue the case, wheras a country cops and lawyers might look at it as country justice and not pursue it.
I think the DA gets to decide what cases to file or not. Meaning he gets told of a crime by cops and he decides to proceed in court or not. I could easily be wrong.
In that model, the cops may not bring it to his attention. The crook's Public Defender may be too swamped to mention it to the crook so he can file assault charges. In some states, the victim (unless dead) must file charges for the police to proceed.
This is why some abusive husbands don't get arrested because the battered wife won't file. In Wisconsin, the State can file assault charges, bypassing the wife (I have a sister-in-law who lacked the gumption to fix her life herself, and the cops looked at her and arrested the jackass).
So, if the crook doesn't press charges, the grandma escapes notice of the legal system (and I suspect more cops are going to side with grandma to smooth that along).
In short, despite the rigid rails of the legal system, the humans working within it use their own ideas of justice to ride the train WHEN they see fit.
That last sentence while I know it is true has the potential to scare me the most.