So here is a little background on my situation:

Dated a chick in HS in the mid 80's. One Friday She calls my Mom, refuses to speak to me directly and leaves it to my mom to dump me. The reason she gave my mom was that this guy was getting into med school and was going to be loaded. Also he was mid 40's and she was nineteen at the time. Apparently she married the guy that Sunday, and they had left our small town by Monday. I had not heard a peep out of her.

Needless to say that was a psychological shock, and I responded by unknowingly redpilling up. Worked out, got an education, and lived life. In the late 2000's I started my current LTR, with a woman ten years younger than I. I know about TRP's biases in that regard, but it is a comfortable RP relationship for someone getting older and wanting to settle. So back to the situation, I took a job Several states over, and we moved to a small bedroom community so I could commute easily. By some unholy coincidence the ex happened to live there as well, along with the husband. We stumbled on that fact one day at the grocery. She approached because I honestly did not recognize her. Apparently seven kids, an abusive husband, and god knows what else had really taken a toll. This girl went from looking like a young Sarah Michelle Gellar to the possessed chick from Army of Darkness. She tried to initiate conversation, but as soon as I realized who it was I turned and silently walked. LTR was asking WTF until I explained on the car ride home.

Later that week the phone calls started. I didn't recognize the number, answered, and as soon as I realized who it was I stated that I never wanted to talk to her again, and to stop calling. She kept calling. Eventually I changed numbers. She started calling the new number as well. I then shut the phone down, and had to rely on the LTR's cell for personal communication. She called that number and the LTR handled business.

Once the phone was shut down she started bombing my Facebook. I changed privacy settings, etc.., but I keep getting harassed by new avenues. At some point before we moved to a different town, she was slowly driving by our house on occasion. We noticed this when we were grilling with friends and one pointed her out, and stated she had made the block five times by his count. Once everyone turned and noticed, she punched it and sped off.

This has been happening sporadically for about six years. It appears to flare up when myself and the LTR hit high points, such as the birth of our child. We've looked into a restraining order, but she hasn't been violent, so that doesn't apply. My question is how to finally disengage this motherload of crazy?

EDIT: After conversing with the cops from our former town again, and being persistent, they got me in touch with the husband. Apparently there are medical issues at play, and several other people have had these issues with her as well. The supposedly abusive husband seemed OK from the brief call, and said he would take care of it.