Wild Card Theory. What if the reason Sherrill seemed worried, and what if the real reason Susie wanted to go home that night was, she was worried about Sherrill, and, that they had been getting harassing or threatening phone calls. Hence the call on the answering machine that was "Supposedly" erased? And possibly if she is to be believed, the call JK received when she and MH were in the house. Although, this goes against all my feelings regarding MH and JK. Again, a Wild Card Theory.