Could be a number of things. Her subconsciousness tries to tell her something. It's a shadow person. It's something medical. I would advise her to
get medical advice to start with.
Is she a fearful person? Traumatized? After having had too much stress and/or to long the brain changes. This has been medically proved. You become
wired for fear. The part of the brain we share with mammals gets into fear mode where the signals go in a circle. Never ending fear.

