You clearly have a nutter on your hands. I had a similar problem with a neighbour letting my old dog out of our garden and taking him into her house to play with her kids whilst we were out. The dog BTW, was quite content with his own company, and wasn't so keen on having his tail pulled and eyes poked.
I solved the problem, after several polite requests to cease and desist were ignored, by going mental.
Shouting, swearing, waggling fingers, swinging arms wildly. Garbled nonsense about respecting boundaries, overstepping marks, and theft of livestock. A good analogy about coming into your house uninvited to help the kids with their homework helped too.
She never even looked at the dog again. Cross fence relations were extremily frosty for the rest of our time in that house though.