iwishman, Know exactly what you are going through and what you must feel.
Had a neighbour like that once, she used to spend her time,on her knees behind the front door peering through her letter box at my house and family.
It was a bit unnerving just to see 2 eyes watching every thing you did , or who came and went.
But for me the only thing was to ignore it , which was very hard and eventually it all stopped.
I think I made the decision that a barmy women next door wasn't going to ruin my life, and if she wanted to waste her life like that ,then that was her choice.
So be as strong as you can, you have done all possible and good luck.