Who knows why she thought it was her land--maybe she thought the right of way on the deed "went away" when the property was sold. Maybe she thought that despite the deed, she'd be damned if the state could have "her" property. Maybe she was acting even worse than she did in New Hampshire when it came to someone else taking "her" property (despite it being the state's property). Maybe she's just crank who ended up getting her son and husband involved in killing not one, but two cops over land that wasn't theirs in the first place.
Given the nature of this family, you can expect them to be quite outspoken to the media--and doing so will sink them sure as...well, you know.