My neighbor has giant pines on her side of my fence. Branches hang over my side. They've twice come down and broken my fence. I had a tree company come take a dead one down that was actually on her property and at risk of damaging mine and another neighbors and I paid for it. I asked if she wanted any others down when the tree guy was there and she said no.

Giant tree came down 2 years ago and is leaning against a tree in her yard. She tried to get me to pay for it. To be extra neighborly, I told her if she found someone, I would cover half the cost, but that I wasn't arranging work on her property.

Despite all this, she blames me for the leaning tree and stopped talking to me.

I don't know why I'm sharing this except to say that trees on property lines are a huge pain and you can't win no matter what you do.