First of all, I agree that you should wait to take any action -like ceasing to mow the lawn, etc- until you are 100% positive it was her. Then, if it was her, and she is unapologetic, or feels her actions were justified, then stop doing her any favors. Why, oh, why on earth should you expose yourself to that kind of negativity and selfishness? To feel like a good person? Please. If you want to feel like a good person and a good neighbor, volunteer at a soup kitchen or your local animal shelter. Don't let her walk all over you for the sake of doing a good deed. Especially if she's not going to appreciate it. There's no need to be a martyr. Of course you don't do good deeds for a pat on the back, but it's kind of dumb to let someone walk all over you.