When last we left Claire, she had just disappeared, leaving baby Aaron alone, only to later appear to Locke in Jacob's cabin, chilling with her father. I hope you got a good look at her then, because you won't be seeing her at anytime during Lost's fifth season. She will return for the final sixth season, however, so stay tuned for that. She didn't have too much to do last season, but just to write her out for a full season...hopefully she'll at least be mentioned and not completely forgotten for a year.