Screenshot from the episode.
"The Changeling" is a Halloween-themed episode of the TV series The Waltons. It first aired in the United States on CBS on October 26, 1978.
Plot
It is around Elizabeth's birthday and she is growing up, but strange things seem to happen to her that nobody else notices. Later, she is having a birthday sleepover party and the family finally realizes that she is experiencing poltergeist activity.