Yeah, I heard about that too. On one hand, I think she might survive because of the islands power to prevent death in some cases. (Example: When Locke got shot by Ben at close range and survived.)

On the Other (xD) hand though, Lost has a habit of making characters have sudden, shock deaths. Even if she does die, I'm certain she'll still have a flashback episode - maybe just shown through another characters eyes. Possibly Bens, or Alex's flashbacks?

I feel sorry for Alex at the moment! I'm hoping this is the turning point of her character becoming a major character.