Anyone claiming that God speaks to them causing them to act or to teach in the manner directed of God, that person becomes a mouthpiece for God, even known as a prophet. In this case, "many false prophets are gone out into the world" (1 John 4:1). To randomly kill people because it is the eclipse makes no sense whatsoever. The voice she heard was not from God, but "no marvel; for Satan himself is transformed into an angel of light" (2 Corinthians 11:14).