more information is needed. do you have a fence? is this just a regular neighborhood...a mobile home park or a development with covenants? do you have keep out and/or no trespassing signs up? does she have mental issues or is she just plain crazy? does she have other relatives living with her? first thing is find the non emergency telephone number for police in your area and start there. maybe try a visible fake security camera and look online or local security stores for fake security signs and/or stickers that warn of 24 hr video surveillance.