Let's see here
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1)When
Sayid and
Desmond arrived on the freighter, they were held captive in the the sickbay. Regina acted as their guard. Distant and confused, she spoke with Frank after he approached. He made mention the book she was reading was upside down. She then let Frank in to see Sayid and Desmond.
2)Later that day, Regina walks out onto the deck wrapped in chains. She climbs the railings and commits suicide by jumping overboard.
("Ji Yeon")
3)She may very well have been mentaly ill due to the exposer to the radious of the island. even though she hasn't set foot on that island. the electromagtism still reaches out that far. But what if she was causing a distraction? For who and why? That is a good question. Who and what reason would be worth your life? Not onlythat. Could soemone rescue her? like maybe she was a decoy and they knew how she would jump with chains and what not and have the proper tools to cut her out and bring her to saftey? In order for thatto happen someone had to know the action the captin would take. Now that is a streach. Mostly just rambling. But what if she jumped on purpose?