I'm not convinced she's schizophrenic. I totally think she's on some heavy meds and more than likely anti-psychotic medication. Her behavior seemed more noticeably erratic after the breakup with Justin and she must have been like 19 or so? That would be early for a female to exhibit schizophrenic symptoms (more like late 20's), not that it wouldn't or couldn't happen at that age though. I think most of us agree she was using drugs/alcohol in her early 20's and that is often used by people with mental illness to self-medicated. Her speech during interviews doesn't come off disconnected like a schizoprehnic.
If I had to guess I would say she's a severe bipolar, type I. Someone with that can have psychotic behavior during a manic episode and we all know she has had at least one of those (hello umbrella and shaved head). She could be on serious meds for that. IMO it explains her behavior and early onset better than schizophrenia. Schizoaffective disorder (bipolar with schizophrenic psychosis) could explain her behavior as well and developes during teen/early adulthood. I don't know though....
Bookmarks