User blog comment:FairyRaven/Fairy Tail Chapter 399: Wings of Despair, Review and Commentary/@comment-77.194.131.112-20140908094415/@comment-9595671-20140908143302

Yep, makes sense to me

I don't think she was poisoned, but I think being inside Zeref did do some damage for a while.

Has it been a year yet though? I'm pretty sure Future Rogue stated that Frosch died a year around the time he was beaten so I doubt its here. I mean it can't have been a whole year in the series already could it?