Honey,
I'm really sorry to hear about your loss.
Can you fight fire with fire, I can't imagine this neighbor of yours loving Ozzy Osbourne or Gregorian Chants played LOUD selectively throught the night.
Done right, she'll be calling the sheriff on you, by the time they show up the music will be off, and with any luck the neighbors with you will reply, what noise?
A few weeks of that, and she'll be a real rubber ramada candidate!