Absolutely riveting start to finish. The film leaves the viewer on shaky ground for 97% of its runtime, during which we don't know whether to trust, admire, loathe, or support the main character in her bizarre efforts, which service's its overall themes.
The ending to me is perfect — you get the satisfaction of a neatly-summarized who-done-it, complicated by the lengths that our main character went to in order to achieve that ending, which only serves the cycle.
A perfect movie for people who love true crime and feel weird about it.