Private property.
My dad just died last year.
I think they probably targeted her because she’s a new 80yr old widow.
It might be a good idea to have somebody younger stay with her, until this is sorted out. I have a bad feeling about this.
And make sure the perimeter is thoroughly posted with “no trespassing” signs.
I often watch the TV program “What On Earth”.
Space satellites have fantastic cameras that provide great detail and measurements. One pass could easily survey the property in the daylight. The images sent down can be magnified to provide greater detail.