The sign that Betty is bewitched in the play "The Crucible" is her physical state in the first scene. She is in a coma-like state and fails to give a response to anyone. The religious leaders interpret this bizarre behavior to mean she is under the power of the devil.
"The Crucible" was written by Arthur Miller in 1953. It is thematically a response to the hunt for communist sympathizers within American society led by Senator Joe McCarthy and the House Un-American Activities Committee. The play is a fictional version of the real-life Salem Witch Trials of 1692. Many of the characters in the play are based on people who were involved with the historical Salem Witch Trials, such as Abigail Williams and John Proctor.