You could just block her then, if FB is the main source of where the bullying occurs, then if blocked, you, also, won't be tempted to read her words.

In my state, there's a 'harassment' 209A. You need to show, at least three instances, of harassment. Which, blocking fb, before gathering evidence, might not work. Do you know, how to screen shot???

Now, she's blaring the radio, only to turn it down, when she knows that the cops are coming, because she has a scanner. Could always record this. Video with a time stamp, walking into the hallway, can actually show where the sound is coming from, the audio/visual effect. Not sure, how to get that into the courthouse, well, my courthouse, no electronics, but if you leave it, in your vehicle and getting a written note, from the judge requesting permission to bring it in, it can be done.

Good Luck, with the noisemaker, bullying neighbor.