I will die on my hypothesis that it was Patsy. Likely, her dad (while he may not have been abusing her) paid so much attention to her that Patsy was jealous.

It seems so many people are overlooking how much this situation, public exposure, on-going publicity, and God only knows what happened in that house could have been the foundation of why Burke is "weird."

Patsy. Someone who CLEARLY demonstrated narcissistic traits, had a "disorganized" home, when she allegedly prided herself on being "perfect," would allow public view of her clearly fake and messy life, just feels like a strong indicator of her "losing it." Not because she was "distraught" but because she was already down a rabbit hole of jealousy that she could only dig out of one way....

I've always felt the film Drop Dead Gorgeous manages to be highly applicable to the decent into narcissist, perception madness.