[BoppreH]

If the story was about a dog that dug some wires I would agree, but people are capable of a lot of things, even at old age. God knows how long she'd been digging.

Also, on the Guardian article:

  The cable is owned by the Georgian railway network. It is heavily protected, but landslides or heavy rain may have exposed it to scavengers.

If that's just an excuse or not, we will never know.