This is the closest I know...
1 Corinthians 2:11 For what man knoweth the things of a man, save the spirit of man which is in him? even so the things of God knoweth no man, but the Spirit of God.
Nice try but the same would hold true if the rapture was Mid or Post Trib.
Are you asking us to take an Amil or Preterist position to circumvent Mark 13:23?
Is she leading Christians astray?
My take?
If they are Christian then it serves them right for following (as a devotee) anyone else but Jesus Christ. (some lessons come hard)