User blog comment:IamJakuhoRaikoben/Chapter 468: Memory of the Stars, Review./@comment-24277053-20160109232549/@comment-7418318-20160110090709

Oh, so you didn't mean to say that it actually is their fault, but that someone in the story might think so? "so it is Natsu's fault that Lucy's mother died" This sentence sounded so definite that I got the wrong message it would seem. ^^

Okay, that is possible I suppose, but as you pointed out yourself, the one who would be most affected by the matter - Lucy - would never think so (and would foregive them even if she did :P ). Natsu and Gajeel probably won't think so either, if they think about it at all and I have no idea how Sting and Rogue would react.

Wendy might feel guilty for Layla "dying for their sake" if she learns of this though, but I'm sure the other guild members, Lucy formost among them, will immediately console her and tell her she's not at fault. That would make a nice scene, but with the speed and directness that Mashima is pushing the story forward right now, I doubt it'll make it into the manga.

@Starpower: I'm not sure what you mean.