My interpretation of this story is one of a young adult female experiencing the onset and waxing and waning of paranoid schizophrenia She is in the right age group and has the typical features of this illness.
I questioned my own sanity as I felt for her and what she was going through.
But as the film goes on it gets better and better.
In Brians Wohnung wird sie festgenommen und in eine Psychiatrie eingeliefert.