My advice:
Don't allow your neighbor from hell to turn YOU into a neighbor from hell -- even though I don't blame you for having fantasies about really giving her hell.
I hope she DOES move on the 14th or even sooner -- AND I hope she'll get professional help to steer her away from being a neighbor from hell to her next neighbor.
Hopefully, the next person who moves next door to you will be safe and sane.
First I would only be a neighbor to hell to her. Second she poisoned my garden she could have killed us. Since she seems to be getting away with it unless she does something else. I think being a neighbor from hell for the next couple of weeks is totally called for. Cause if we are this far away from her house and she is doing this what will she do to someone else. Maybe if we can teach her a lesson now she will never do something like this again.
This reminds me of a story closer to home where an idiot neighbor was shooting over a property line. He and another couple of families had been causing the family whose property was being shot over all kinds of grief by making it impossible for the family to safely do what they wanted to do, which was raise horses. They poisoned the water by pouring some sort of solution such as gasoline in it; unplugged the electric fencing; etc. The family had to throw out all of their hay and any kind of horse feed where they had already opened the bag, as they didn't know if these neighbors from hell had tampered with that. Anyway, they were considering leasing a portion of their land to a pig farmer with this being done as close to the property line as possible so that the pigs would stink up the property of all three offending families and hoping that the shooting neighbor (who wasn't the brightest crayon in the box) would shoot at the pigs; get in trouble with the pigs' owner; and end up losing his property due to either going to prison or paying a lawyer to keep him out of prison. They were actually planning on keeping the little pig farm going until it ran all three families out to where they'd sell their property on-the-cheap and the family would buy it; rent two houses out to people of their choosing; and live in the best house. And, of course, they would be collecting rent from the pig farmer.
Hopefully, if you do this, it won't end up driving your neighbor to do something even worse such as opening fire on you with a gun or setting your place on fire.
This woman clearly needs professional help and is going to be an angry person until she receives it.
I have a theory as to why she's wrongfully blaming and punishing you for this but will private messenger you later about that.