User blog comment:FairyRaven/Fairy Tail Chapter 324: The One Who Closes The Door, Review and Commentary/@comment-88.80.242.78-20130322143709/@comment-1776824-20130322150452

The only sound issue is: how did she travel into the future? Time-travel is written in the Book of Zeref, which, from our understanding, she didn't have, and that was 14 years ago in the present Fairy Tail timeline. If she's stuck in another dimension, in which the only one we know of is Edolas, then she's never returning. I'm not saying you're wrong, I'm saying that there's no logical conclusion unless she shows up with the Book of Zeref saying that she went forward in time.