I'm thinking about mercury poisoning over a time. At first in low dosage I think it would show in like ear infections, dizziness etc. Maybe the pancakes had a lot in it. I'm think JP wanted while acquaintances were over for her to have a fatal heart attack. That didn't happen.
Maybe it wasn't mercury but something else but he I think wanted her to die there. I also think if it was pills he staged the bottle somewhere. When his plan didn't work, he went to plan B with daddy's help.
Is mercury hard to get any more? I thought it was kind of scarce these days. Not at all sure, though, haven't needed any lately.