Looks like we won't be seeing Libby anytime soon in the upcoming flashbacks of Desmond and/or Hurley. Which probably means that we won't find out just yet why Libby was in the SRMHI or what happened to her husband(s). It also makes me wonder what time period Hurley's next flashback will be from?
The latter half of the answer is interesting. Who do you think Libby has a connection with? Juliet perhaps?
Question: What's the latest on Cynthia Watros returning to Lost to finish out her backstory?— T.K.
Ausiello: I asked Lindelof-Cuse that very question when I spoke to them for AA's 100th. Here's what Carlton had to say: "We would love to tell the rest of [Libby's] story, it’s [just] a question of whether we get to it. We’re now working on the early episodes for the second pod, and we want to get back to some of the characters we haven’t seen, and spend a little more time with them. We'd like to get to Cynthia's story, but I think we're going to try to tell the stories of our regular characters before we do that." Adds Damon: "Obviously, we have a couple more beats of Libby’s story to tell to fill in the missing pieces, and the way we would tell that story is in the flashbacks of another character. But that character can’t be a character that we already know and love, otherwise they would recognize Libby. We know who those characters are and what those story beats are, but it might be a while before we get to their flashbacks."
Source: Ask Ausiello
