How can I exact revenge on an (ex friend) who is a predator?

I (27F) and my husband (26M) recently found out our ex family friend (20F) was grooming our child (9). For context, this family friend had been living in the same town as us until recently and because of her moving and how close the two of them were, we trusted her at the time and allowed him to have a phone to keep in contact with her ocassionally. I and my husband didn't discover that she had been grooming him until I was looking through his phone after doing a routine check on his devices. I wasn't aware until I had caught her sending nudes to my child in private (we have not allowed him to have any online access and do routine checks on his phone every week) and found out through some prodding and convincing that she was deleting messages and speaking to him over calls. As soon as I found out, I, my husband, and several others have blocked her and she turned to trying to reach out us through other friends and stalking people (I.e contacting their place of work, stalking online accounts on several platforms, and mass emailing/calling). On top of everything, she has taken to harrassing my husband to the most extreme lengths.

My husband, for context, has GAD (Generalized Anxiety Disorder), and her harrassment of trying to get in contact with him through every means possible has taken a serious toll on his mental health and overall health period. He recently had to be hospitalized after she called his place of work and he spiraled to the point of trying to end his own life. Before and after my husband has been hospitalized, we had both gone to the police and tried to escalate the situation, but they haven't been responsive or even active.

As of now (as of when writing this post) she has realized she cannot talk her way out of this, she has turned to specifically targetting my husband by taunting him through mass emails and even going so far as to write out sexually explicit stories of her assaulting our child and other disgusting and vile things.

Is there something I can do? She has tried to paint us (my husband and I) out as horrible people and I would like to go scorched earth but don't really know how to go about it. Please, anything will help.