But if that's true (JC being honest), then she was up and on the computer at 12:42 am leaving an FB comment, and presumably sending him her final text, the picture of a picture. Then SHE had to turn off her phone and/or take out the battery (I'm still confused on the tech stuff). Then she had to fall asleep, and then the person had to pounce.
So she'd have to something unusual (turning off her phone) while JC was doing something unusual (burning her papers). All on the night she vanished... it'd be strange. However, it IS possible.