Although she calls it the "Auto-immune Disorder of the Soul", a better name would be to call it the "Auto-immune Disorder of the Mind". To say it is disorder of the soul is not right.
We have all been conditioned from childhood...
When the child gets sick, the parent showers the child with attention... with love.
This is when this behavior is learned. It is a conditioning of the mind not of the soul.
One is taught that one is incapable of taking care of oneself. Hence, one seeks out a so-called expert when some thing is lost. One seeks out a doctor when health of the body is lost... seeks out a psychologist/psychiatrist when ones mental health is lost... seeks out a minister, priest or rabbi when one feels one is lost in this world.
Health problems can persist out of habit because being ill has become a habit.
Over time one becomes quite familiar with one's disease... if one were to become suddenly healthy, one would feel as though they have just lost a dear friend.
This is when a hypno-therapist can be of some help... or, meditation can be the best of self-helps.