You could always have a friend dress up really nice in a suit and visit their front door. Either tell them that if they persist in the unwelcome actions, legal action will be taken, and all of the currantly gathered evidance of Lori's indiscrestions will be given to Beccie.
That'd shake her up good. Or just have the suit imply that any more unwelcome attentions will "deal with, if'n ya know whut I mean."
Or.. just have the suit(or two) go down, park in front of her house, get out and quietly(without going on the property) take LOADS of pictures of the house, car, close up shots of the front pavement, weird stuff. Then write a bunch of stuff on a clipboard, and nod before getting back into the car and leaving, WITHOUT talking to any of them.