I was thinking that Libby in the hospital was just Michael waking up, realizing he didn't accomplish the suicide, and becoming guilt ridden again..

On the freighter, well I think that might have been another story.. Like Walt showing up to Locke.. That was a warning, since she told him not to do it and when he did nothing blew up..

Gonna watch the Libby parts again when I get home, see if anything else stands out at me..

__________________
Please don't give up, Des. Because all we really need to survive is one person who truly loves us. And you have her. I will wait for
you. Always. I love you, Pen

DESMOND: I love you, Penny. I've always loved you. I'm so sorry. I love you!
PENNY: I love you too.
DESMOND: I don't know where I am, but--
PENNY: I'll find you, Des--
DESMOND: --I promise--
PENNY: --no matter what--
DESMOND: --I'll come back to you--
PENNY: --I won't give up--
BOTH: I promise. I love you.