I think Kate still can't let go off of Jack in her mind- not that I mean that Jack's a hopeless bad guy now (though I have close-to-zero sympathy for this character), but more for her own emotional reasons I think.. She's still kind of interested in Dr and looks for ways to gain him (and his approval) back. I mean, the girl was shedding tears after the failure of her spoon-flirt with Jack and then, she came on to James, with tears in her eyes!! She started to lose me then, got it even worse with this one.

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"Bear...? Is that you?"-- Hurley S03E4