How to handle neighbor emailing my boss?

My boss told me she received a very strange letter from someone she believed to be my neighbor. She almost deleted it thinking it was spam but as she read it made reference to when I moved in and the address she included in her ending message.

I read it and this lady sounded insane. I never met her or spoke to her at all but my boyfriend has. She SEEMED nice… She said I blasted music at 3am causing her sleep deprivation. She then proceeded to tell my boss a long history of her moving due to a KKK sheriff because he has something against Jews. She said the previous owner before me was a part of her sleep derivation team and caused her heart issues. She then said there is a skin head moonlighting cop out to get her trying to get her to move out.

She told my boss she needs her help in having me understand hate crimes and loud music are unacceptable and will defend every legal right to continue to live there.

My boyfriend and I don’t blast music, we rarely ever stay up past 12am because we get tired mad slee before then. I was not there the time she said music was playing.

The only part that was true is when I sent my boyfriend this email he said it was 9pm Friday he listened to music when I had dinner with a friend and she came over to knock on the door to tell him it’s loud. He apologized.
Funny thing is, we’ve “tested” out if something was loud by having one of us step out to see if it can be heard.

Anyway, totally inappropriate to search my name, find out where I work, and email my boss this. My sister’s boyfriend is an attorney and thinks I should report it for mediation? I’m not sure if I should hope this is a one time thing and ignore it…