15 year-olds do not write “manifestos,” even if they are/were intelligent. It's not a manifesto, it's a snapshot of her entire life that evidences both intelligence and a severe, inherent, lifelong, debilitating clinical depression.

It's a picture that starts out fairly lucid, then devolves into a psychotic, overwhelming depression. It shows that the depression caused her to be unable to interact with people, find and keep friends, think logically, and most importantly prevented her from looking for and finding a life worthwhile to live anywhere.

She was socially isolated by the depression, found life not worth living and blamed it on everyone else; because she had no medical knowledge, understanding or logical ability to be able to navigate what was going on.

She needed a psychiatrist, not a mere therapist, and especially not some minister / counselor at a Christian school. Something similar happened to my older brother when he was sent to a Christian university and developed a drinking problem, but the university’s response was “prayer cures everything.” (it didn’t cure him). He never hurt anyone, but he’s still an alcoholic who has given up on life, sadly.