I'm wondering the same. If they're only picking on her, could it be racism? I can't imagine what other alternative motives they would have. She hasn't told us where she lives either.
oh people do crazy shiit for crazy reasons. i knew people who were constantly threatened and harrassed because somebody wanted the house they bought for their own.
sometimes its just hysterical racism or paranoia, at others mean luck. but i would think call on the police and definitely take this upto local council, they should sort out the mess.