User blog comment:The Unknown Sister/Laurel Cliffhanger/@comment-26624146-20161213143444

I think it's Earth-2 Laurel because Flashpoint has already occured and she's still dead, otherwise she would have been around this entire season because she didn't die to begin with. Maybe a Lazarus Pit but that feels a bit predictable and underwhelming. If you wanna see more evidence to implicate Earth-2 Laurel being the woman in the Arrowcave right now see my post below.

http://arrow.wikia.com/wiki/User_blog:Eobard95/Is_Laurel_in_5x09_actually_Earth-2_Laurel%3F