This thread is another example of what to me, seems to be a disturbing new trend in home ownership. People seem to be so worried about encroachments of any kind that they are willing to go to extremes to remove/defend against those encroachments.
We have seen that over and over on these forums...people that are so worried about a fence that is a few inches in the wrong direction, a retaining wall that is the same, an outbuilding that may encroach a few inches or many other small things that in the past would have been considered to be minor and irrelevant, which now appear to be taken so seriously that people go overboard, to an extreme, to defend against them.
The homeowner in this instance certainly seems to be behaving in an absurd manor that could well get her arrested.