If the car is parked on the street side, anyone has "permission" to park, since it's the county right of way. So you don't need permission. Even if it's directly in front of THEIR house. Just because they "think" that spot is theirs, doesn't mean it is. Usually, the county right of way for a two lane road is 60 feet. That's 30 feet each way from the center line. That usually includes some shoulder, or sidewalk, whichever. I find it hilarious that she bitched to you about not having "permission" to move her laundry off YOUR car, but no one ever "permission" to put the laundry there. IMO, you have a case for vandalism. If she does it again, I'd get a police report.