User blog comment:FairyRaven/Fairy Tail Chapter 331: Natsu's Strategy, Review and Commentary/@comment-7418318-20130517165020/@comment-7418318-20130518082644

Besides, would she even know? From what she said it seems like f-Lucy went from the remnants of her cell directly (well... as directly as it's possible in a destroyed castle of which you don't know the layout.... the important point is, she didn't say anything about leaving mercurius' ruins) to the gate, without even getting her celestial spirit keys.