I live in a retirement community in IL which does not allow fencing. The houses are about 3 years old, so my plat of survey is current. I know where my property ends; my customer relations rep clearly showed me when I moved in & it was marked with flags. My back neighbor was never clear on her property lines & doesn't understand how to read her plat of survey. She keeps trangressing on my property, damaging my lawn . Recently she had some kid with a dethatching machine ripping up her sod, and she told him to come down on my property. I managed to stop him, but some of my grass is damaged. How do I keep this nutty woman off my lawn? Should I have an attorney write her a letter? What is the proper way to handle this?