The link to the piece was sent to me by one of my daughters-in-law. I told her that I had heard some years ago about Mother Teresa's "desert experiences," and that these seemed to fit what St. John of the Cross describes as the "dark night of the soul" in his writings -- an experience undergone by the soul -- often far along on the path of sanctity in the pilgrimage toward one's last end. Many American and western Christians might rarely if ever undergo such experiences, since they tend to wade in the shallow puddle of commercialized religious experiences in which they nearly always seek only that which is subjectively felt to be therapeutic. Catholic traditions of ascetic theology show that deeper spiritual life requires a trifle more.
I had not heard of Kolodiejchuk's book in conjunction with this examination of Mother Teresa, however, and it may be quite interesting, even if the Time article seems a bit sensationalist.
Of related interest:
Carol Zaleski, "The Dark Night of Mother Teresa" (First Things, May 2003)[Hat tip to S.F.]