Adventists have the doctrine of soul sleep where they say that there is an immortal soul but it is unconscious until the resurrection. The Watchtower doctrine, while leaning heavily on Adventist doctrine, killed that doctrine and replaced it with a materialistic one where the soul (Nephesh) is the whole body. That includes the "spirit" (Ruach) which they refer to as an animating but impersonal force that disappears at death.
Your mother was probably thinking of this interpretation of "spirit" when she made - probably her personal analogy - a reference to electricity. In any case you can apply that same reasoning to those of the earthly resurrection (any resurrected ones for that matter.
By the way, your clone illustration has been used by sci-fi philosophers pondering whether Star Trek's transporter beam really transports you elsewhere or simply kills you while recreating an identical you at the transport site.