Patsy's sister Pam Paugh was paranoid after the murder

I just found this out today in a video https://youtu.be/N_lKCPMWubk #9 10:10 Pam locked herself away after the murder. People speculated that it was due to deep dark family secrets. I wonder if Patsy and her sisters were SAed. I believe this has been brought up to Patsy before and she denied it, but she might do that even if it were true.

Pam was the one who pretended to be a cop so she could go back in the house and take whatever she wanted.