Who is liable? complex situation with neighbor, landscaping?

I hired a tree service to cut down trees and trim hedges on my property that also served as a fence or natural barrier between my yard and the neighbor's yard. Two days later that same neighbor hired the same company (with the same crew) to cut down a tree on her property and also instructed them to completely cut down the hedges between us. She is 92 years old and told them it was ok with me, so they never checked. (Remember, these are the same hedges I paid them to trim just two days prior.) I came home to find 60 feet of hedges completely gone and am now without a fence or hedges or anything to enclose my yard. My insurance company has denied the claim. I believe the tree service and my neighbor are equally responsible. I believe my neighbor is somewhat senile. We've been neighbors for 17 years and she's starting to forget my name. What do I do to get new hedges planted or a fence installed or something. I have substantial losses and no one is willing to pay up. What do I do?