[Overpaid Slacker]

I'd say that the next time you had to clean chicken ***** off of your property b/c of her "carelessness" there might "accidentally" be fewer and fewer chickens returning to their coop.

If it's legal to discharge real firearms on your property, next time they come on, fire a few rounds (not nec. at the birds) but if she's only a kilometer away she'll hear the shots...

Or, rather than hose all the chicken ***** off, scoop it up, and leave it all over her doorstep, with a little note.

She's obviously not at all concerned about being a good neighbor herself, or avoiding a feud with you.

How about making a trail of chicken feed out into the road?

JP