She's not coming back: ‘The Blacklist’ Star Megan Boone Leaving NBC Series After 8 Seasons – DeadlineI thought about that possibility rather than the possibility of she working on another project,
A maternity leave sounds reasonable to me, that the producers would be willing to accomodate her, and still keep the Liz character in the shadows so to speak.
On the other hand, I don't believe that the producers would be so accomodating if Megan Boone told them something like: "Hey chiefs, I won't be showing up for work in the next months because I'll be working on another TV series, but keep my character alive, please and I'll be back as soon as I finish that other project"
Having said that, I don't think she'd be back soon in case the maternity leave is the reason she's been absent.
Without researching (I prefer not to know anything until after the episodes), I'm assuming she is finished with the series. But as long as James Spader is still on staff, there could be a cliffhanger involving him to keep us interested. If he goes away, they may as well pack it in since the show would have no life left.I don't want to post a spoiler. Do a search for Megan Boone.