I have heard some rumblings on the return of Cindy next season. check out TvGUide
"BiggestLostFan said "I've heard Kimberley Joseph is returning as Cindy in season 3, can you tell me if she will be back full time or just for another guest spot? And if the rumor is even true": LOST - Indeed we are supposed to learn what happened to Cindy after she suddendly disappeared. So far, she is only planned for a guest spot. However, as they start shaping Season 3, maybe she'll be asked to be in more episodes! Stay tuned!"
Source: TV Webchat
Thanks to Spiteful82 for this information.
