She was getting divorced, having her kids taken away from her, constantly in the public eye, suffering from terrible mental health problems, etc, etc. I don't blame her at all.
Edit: apparently, someone thought my first response was what actually happened... no, I don’t think she shaved her head to avoid a drug test. Right, I was just highlighting what people thought she was doing at the time, not my personal belief of what happened. I, too, believe she was just going through a tough spell, and all her pressures came crashing in all at once.
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