Well, I understand that what Thunder Book probably meant wasn't a Jessica Culprit Theory but a way to get Jessica involved in the events that happen on the island, but just for teh heck of it...
What if Jessica's tongue slips in front of the relatives (we know she's not that cunning, so she might screw up without even noticing, provided she knew such a secret.. One of them (let's say Eva because she's the most fitting for the part) pressures her a LOT, almost tortures her until she confesses. Also, we know that Jessica talks trash about her parents but loves them and always defends them. We've also got the whole 'next head' thing pressuring her. So, all those things considered, Jessica attacks and kills Eva.
But as for why she would kill the rest of them... yeah, never mind.
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It's tough to be blue...
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