I also agree that the OP has dealt with this very gracefully. I myself would have probably done something I regret by this point. I would counsel the OP to look into every legal action she can think of, social services, the AG zoning, filing harassment charges, etc. I would also advise getting a 9mm or 22 pistol as protection just in case crazy lady tries to directly injure you! Get a conceled carry license, if possible in your state and have it on you, concealed anytime you are outside. Do not advertise the fact you have it though, I think the crazy lady would escalate the situation much faster and further if she knew you had such personal protection. Some might say advertise it to let her know, but I would disagree. The crazy lady is trying to get under your skin, getting a gun, and letting her know about it, lets her know she is doing that. So get one, and keep it concealed at all times.
A nice wonderful plant for tuning out neighbors are plants like honeysuckle, they climb up fences and provide a pleasing landscape addition and they smell great. They are spread easily, so a few carefully placed can cover a lot of ground once established. If you have room a wisteria is also great, they are invasive and need to be cut back heavily. But they are beautiful, smell heavenly, and grow huge. I have 4 wisteria and they provide a nice fragrant show every spring, shade for my chickens, ducks, and geese (who know not to eat them), and are drought tolerant.
I hope that this situation will be resolved peacefully and that you find a way to keep Spock.